"The fact that we are here today to debate raising America's debt limit is a sign of leadership failure" - 2006 Senator Obama...leadership failure indeed!
Under-sampling Republicans and independents is a good idea.
Changing the methodology weeks before the election is a good idea.
At what point do you just come out and admit you don't care what they do so long as the Democrats come out ahead?
I'm fairly certain that Vermin Supreme is going to win this election despite what the polls say.
On the other hand, I do believe that polls are usually right. Oversampling Democrats isn't what is actually happening. Party Affiliation isn't something that should be weighted in a poll, because it is an attitude, and not an immutable demographic. It really doesn't matter when the methodology of a poll changes, if the changes are for the better. Cell-phone only households have been rapidly increasing, and correcting for that is a good idea.