No offense, but this is a very elaborate way of saying "I hope".
Obama had an army of populist support. Hey I voted for him twice. It didn't work for him. This is the key thing that I think Bernie and Obama supporters (in 2008) completely missed. Our system is entirely designed to prevent exactly what you're describing. You want change? You need to win in about three consecutive elections... maybe two if you're lucky. Bernie Sanders in the White House will see him having to work with a Republican House which will be even more anti-Bernie than anti-Obama. He will have a Senate that will be a close split between Democrats and Republicans - and many of those Democrats will never support his more liberal tendencies.
No amount of "army of populist support" will change that. Obama tried that. It was Organizing for Action. They're not successful.
Teddy Roosevelt was fortunate. He appeared on the scene at a time when the Political landscape in this country was changing. There is zero evidence that is happening here. Everyone hates the Senate and the House, except for their own Senator and their own Representative. Competitive states are few. The timescale for change is structurally designed - between the classes in the senate and the census for the house - to be very slow.
Fundamentally, I think Bernie supporters if nothing else, don't get this. "What do we want? Change! When do we want it? Now!". Well sorry friend, but your definition and my definition of change may be entirely different. Sorting that out is called politics.
Obama, to his IMMENSE DISCREDIT - and this is probably his greatest failing as a politician - does not and will not get this. He is too cerebral... too logical. That "Vulcan mindset" comment about him is not a compliment. Obama's central political belief is that through reasoned argument and clear selling of points, the logical strength of certain policies will prevail and illustrate why the policy is intrinsically desirable and should be passed. It makes loads of sense... if we're a nation of rational and logical computers. We're not. We're organic beings filled with prejudices and beliefs. Obama never understood that he could make the most sound argument ever and on the basis of belief, many Americans will never want to buy what he's selling. The most effective Presidents - like Johnson, Reagan and Clinton - knew this and made it work for them. Obama either pressed on with his original "logical argument" strategy or avoided making an argument whatsoever... neither of which work.
Some of what Bernie Sanders says makes immense amounts of logical sense. But that isn't nearly enough. Facts are pliable things in politics and whining about how people ignore facts is like whing about the rules of the game. That may not be ideal (it's not), but it's the system we have and the terrain on which the political battle must be fought. For Bernie Sanders, that means "What do we want? Change. When do we want it? In 10-14 years!". Realistically, that is what it will take to transform a society. Hell i'd call that a lower bound.
Bernie Sanders it the President you want at year 14, not a year 1. Obama true believers didn't get that in 2008 and I really think the Bernie circle jerk society is missing that now. I certianly think Bernie is better equipped to be President than Obama - Obama is not a fighter by any stretch of the imagination, and Bernie is. But merely fighting isn't enough. The most effective President's were black belts in the art of politics. There is nothing in his career to indicate Bernie is that. Being well meaning isn't enough.
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At it's core, it's a high drama philosophical debate. It's worth noting that the true believers on either side - left or right - are relatively few. Loud mouthed, but a distinct minority. Most people are certainly center-right or center-left, which is why historically Parties in the US (and the wider Western world) lived there. It does represent a type political consensus that there are boundries on the far right and far left.
The single dumbest debate in America is over the size of government. Big government. Small government. Outside of the true believers, nobody gives a fuck and the question itself is stupid. Why do I say that? Because polls have consistently shown that regardless of states political affiliation, Americans LIKE Government services that are intriniscally socialist in nature - Social Security, medicare, some degree of regulation, roads, public schools, public universities that kind of things. But Americans also have concerns about too intrusive a government or a wasteful government.
What does that tell you? Big Government versus Small Government misses the point. Americans want efficient government. A lean, mean fighting machine that doesn't do too much, but also not too little.
The true believers on bothsides though... they live in this highly dramatic and philosophical world that is much more adherent to a consistent and rigid political orthodoxy. You saw this when Republicans tried, stupidly, to blame the financial crisis on government overspending rather than a decade and change of deregulation. You see this when Obama's solution to universal health care in this country turned out to be largely bureaucracy and paperwork factory that has done barely anything positive for the 85% of Americans that already had Health Care.
There is a direct line between Bernie/Obama supporters (at their respective times) believing their champion here can really change anything, and Republican true believers who sincerely believe that a Republican President will get this country one step closer to overturning gay marriage, banning abortion or cutting spending. Let say Ted Cruz got elected. Now personally, I think the man is a monster who shouldn't be Senator, let along President. But if he did, the internet would lose their shit over Ted Cruz being President.
But nothing bad would happen. Because he'd have a Sympathetic House, and but a Senate that may be Democratic, or at the very least, could Fillibuster. It took a massive financial crisis for Democrats to gain a fillibuster proof-majority, and it lasted about a year (until Ted Kennedy died and was replaced by a Republican). Republicans at the end of Ted Cruz's term would likely be as disappointed with the results as progressives are of Obama.
The thing is, this shouldn't be terribly surprising. I talk a lot about NASA in the forum, but it's a very instructive example as a government agency, because NASA's footprint is in a very interesting set of states that is geographically and economically diverse, but more than that, is pretty evenly split between Democrats and Republicans. In this particular case, it's instructive because since 2010 when Obama cancelled the Constellation Program, Democrats and Republicans have teamed up, against the Obama Administration, in defining the next steps of this country's space program. It isn't Democrats versus Republicans. It's Obama versus Congress. It's very, very strange to have Liberal Democrats vote with Ted Cruz just because they're all from NASA-heavy states.
This will extend out throughout the entire political spectrum. Let's say for example, Bernie actually becomes President and tries to cut defense spending. Never going to happen. First it won't happen, because the political consensus that exist, even embraced this year by Obama, that Defense spending needs to go up by about 10% per year (if Congress passes a budget this year and not a year long continuing resolution, it will get a 10% boost). Because that Consensus exists in Congress, a Bernie proposal will fall flat. He might expect liberal democrats to side with him, but consider even a neighboring state to his own, my state, Massachusetts, major Defense Contractor Raytheon is one of it's largest employers and billions in defense money is added to our state. Sure a representative from Cape Cod might vote against raising defense spending. But Northern or West-of-Boston? Not a chance.
One just has to look at Obama's historic lack of failure in getting "his budget" passed to see how unsuccessful Bernie or anyone like him, right or left, will be. Presidents always have a hard time getting "their budget" passed, but Obama's been uniquely a failure at that. He submits a budget, and on pretty much everything, Congress ignores what he wants. Way less than his Predecessors. Even Clinton with a divided government had far more success.
What Bernie wants - like what Obama wants, would require a revolution in a Congress going along with the President on spending, that even with Barack Obama, except for something like Obamacare, even Democrats were plainly unwilling to do. That is why the true believers on the far right and the far left never win and never will: because for all their beliefs, parochial state concerns that tac towards the center will always win. President Ted Cruz would never see his Mega Cuts that would sap money from many states, and President Bernie will never see a mass reorganization of what American spay for to suite his social-democratic agenda. He may be all about "butter", but huge swathes of America are perfectly happy having factories for "guns".