There's no doubt there are bad apples on democratic party, but the notion that they are one unified block is absolutely wrong.

We essentially have two parties: Republicans and party representing everyone else.

For example check Blue Dogs caucus, those are essentially Republicans that don't line trump. So called New Democrats are calling themselves centrists. In American politics what's center is called right everywhere else.

This is why Democrats often fight as aggressive as we would like them too, because they need to find compromises between themselves. Want Democrats that fight for people, vote in primaries and local election and install progressives. There's a shift, but we need a bigger one.