What "meltdown"? The Dems vote more consistently for progressive goals than they did a generation or two generations ago, back when the Dixiecrats dominated the leadership.
The difference is not the nature of the party but that there are LESS of them. The New Deal required almost EIGHTY Democrats to get majorities for what were compromised progressive legislation in many cases. LBJ's Great Society had similar overwhelming majorities.
If you gave me the choice of the political makeup of the Democrats in 1937 or 1965 or the politics of today's Democrats, but with the total numbers from 1937 or 1965, I'd keep today's Dems in a heartbeat.
They are more consistently pro-union, more consistently in favor of civil rights and women's rights, and of course better on social issues like abortion and gay rights.
If the Dems are interested in "bipartisanship", it's because they can't get anything passed without it, since they are in the minority. Give them an overwhelming majority and their interest in bipartisanship would disappear quite rapidly.
Nathan Newman