It probably has to do with the fact that 'internet denizens' tend to be spread out all over the place because of how the internet works, and because of the asinine voting system we use it discourages minority (as in Minority political beliefs) parties from voting for representatives.
Let alone the gerrymandering and other sorts of bullshit that contaminate the entire system.
I've voted in every election since I was 18, not one of the people I have voted for in a general election has made it into office.