How many Democrats would suffer political backlash for voting to impeach Trump? Regardless of ideology, I can't think of many that would.
I don't know why you assume that if they wouldn't suffer a backlash for doing it, they are automatically going to do it. I think a better question is how many wouldn't suffer a political backlash for
not voting to impeach? There is also a reason I keep adding the caveat of if the majority is a small one, because that means a small number of Democratic Reps can tank the vote despite the vast majority voting for it
(which I think depends on the case against Trump), since Republicans will vote as a bloc. I think you're not appreciating how difficult it will be to get every single Democrat, or almost every single one, to vote for this, assuming Mueller's work isn't done yet, or it is and there doesn't appear to be a strong case to impeach.
Again, I just have to disagree. I think you're approaching this question all wrong.
(Also I strongly disagree with your assertion that there "There isn't a dime's worth of difference between "centrists" and "progressives" in the Democratic Party." It sounds like Republican talking points that wave off the differences of Dem. party factions in a way that only a conservative who doesn't understand those factions would do, altho I'm not saying that's your take exactly... but it definitely reminds me of that)