There are many ways in which the Democratic Party is pursuing an agenda that is bad for ordinary Americans, but for the most part the public hasn't grasped just how and why it is bad for them. There are two areas, however, where the public has clearly and substantially rejected the current agenda of the Democrats in Washington:
1) Gun Control,
2) Increasing immigration -- especially immigration of refugees from the civil war in Syria, but also generally.
The polling on these is clear, but if you don't trust polls practical behavior by Americans shows the degree to which these positions are rejected. On the one hand you have the record gun sales across the country, lasting for years. On the other you have the sustained popularity of Donald Trump, whose major virtue in the eyes of the public is intense, loud opposition to immigration. You've got the fact that a majority of state governors felt that it was good politics to formally reject new refugees last week.
What if we could combine both of these into a single symbolic effort to tie the Democratic party to the two things Americans have most clearly rejected?
Mike's got the principled argument against all this right in his post below. Even if you rejected the principles, though, politically this is irrational. It's as if they were trying to throw the 2016 elections.