The funny thing is it wasn't even Pelosi and Shumer - the R's did it in.
Not just the R's, though. The Dem/Media complex played a crucial role as well: the oppositional media coverage on the plan was just brutal -- well-organized and widely disseminated, with the usual poll-driven negative feedback loop. And then, of course, the R's themselves going for that sure-fire loser, the "all or nothing" legislation.
The post-mortem will show death by rushing, trying to do too much, and "my way or the highway" antics by the "Freedom Caucus," who can't be bothered to account for political realities.