Actually Democrats have had no problem being party bosses who institute corrupt longstanding institutions. Take a look at Tammany Hall or the stories of Lyndon Johnson's first foray into Congress ("Hey, get that vine off that tombstone and write that guy's name down. He's got just as much a right to vote as anyone else here!")

Dems were caught somehow sleeping while Republicans instituted a lot of gerrymandering (see the book "Ratf*ked").

For inspiration, maybe a little Spencer Tracy "Last Hurrah".

Anyhow, it's not the party, it's the principle. Right now in the national political life, the principles are more with the Dems than the Reps, who chose a rather warped policy under the likes of Newt Gingrich and the guy most admired by the affectations of the OP, Mr. Trmp. But the Democrats are merely human and just as subject to the truism of power: Power corrupts, but it also rocks!