The thing is, they only need one. One Article that the House of Reps can agree on, and that the Senate can support.
In my prior post, I mentioned they were sticking to the "sure thing" rather than the "kitchen sink". To me, this suggests that the Democrats think they might actually get the Senate on board. McConnell can't throw it out; he's legally obligated to hold this proceeding. And he doesn't preside over it; Chief Justice Roberts does. So things can't be QUITE as blockaded as they would be for a normal bill. They're going to have to vote, and they're going to know history is watching, and we might see enough Republicans say "yeah, that was abuse of power" that the Senate might actually convict. To at least some Republicans, damage control needs to be what they're thinking, and voting to remove Trump is a first step. If they don't, they'll wear that choice the rest of their careers.
The "kitchen sink" approach I would have expected if they were expecting to fail in the Senate regardless. List everything, as damning as it is, and put it out there publicly. Use them, and the Republican response to it, as the basis for the 2020 election run. If the House voted to include bribery, money laundering, racketeering, etc in the list of Articles, they could be referring to those in every campaign ad. Not likely to attract Republican voters, but it might have the same suppressive effect that the Clinton email fiasco had on her campaign.
The advantage of the "sure thing" is that, if you can get him removed, you can roll out criminal charges for every goddamned thing you left out of the Articles of Impeachment. He isn't exonerated for any of that, and those criminal charges can be held for when he's out of office.
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I mean, he didn't "get away with it". He had temporary immunity from prosecution. Not the same thing.
Either way he was cruising into 2020 with his unmovable approval rating and got done in by a phone call. 4d chess at work there