If anything the Democrats in the Senate and House are perhaps too bent on playing by the rules and being goody-goody, even if that's how it should be.
The Republicans could give a fuck about the rules, about candor. They refuse to cooperate and work across the isle. It's all their way or no way.
The Democrats are the ones who usually let in. They acquiesce to the demands of Republicans to get their bills through, in the hopes Republicans will likewise work with them in the future. But, the Republicans pull the rug again and again and refuse to work with the Democrats when it's their turn. They undo all the bills and regulations the Dems put in place. They give their rich buddies tax breaks and put the weight of that on a shrinking middle class. They have the lobby in their pockets, buying their votes.
That's not to say there aren't some Dems who are just as bad.