I think that if the evidence is as solid as it seems at the moment, that if the House votes to impeach, the Senate will be in a tough spot. You either align yourself with a very unpopular, just impeached, president who is likely to lose in the next general election, or you jump ship and try to stand apart from the sinking ship. That's a genuinely tough call if your only motive is to stay in office (which we know isn't the right motive, but is probably the one they have).
On the one had, you stand a much better chance of surviving the impending Trump implosion. On the other hand, if Trump doesn't implode (which he keeps managing to pull off), its your ship that will sink.
I think the Democrats in the House have no choice but to try to maintain checks and balances with the executive branch and hold to the political process as its intended to work. It aligns well anyway with the reality that's going on, which is Trump vs. the US political structure. But I don't think the democrats really risk their own political careers or a second Trump term by pressing forward with impeachment. And they need to put the squeeze on Senate republicans.
If the republicans circle the wagons on Trump and he loses, we could actually see a blue wave. Which is not really something I want for two reasons. One is that I'd rather see the Senate do the right thing and hold POTUS accountable. I'd much rather that they had scruples than resort to partisan politics. But the other reason is that I actually despise a lot of things the democrats propose, and I don't want to see Warren or Biden get the presidency and all of congress. That could be a real legislative nightmare. I prefer gridlock.
