Insulting and belittling California Congresswoman Maxine Waters is how President Trump revs up his base, mocking her in ways meant to reflect badly on her race and gender. For Democrats, his brand of biased mockery is job insurance for Waters, not that she needs any. The biggest new class of Democrats since Watergate is coming to Washington to challenge entrenched power, but nobody’s looking to oust Waters, who turned 80 this year and has served 28 years in Congress, every one of them on what was originally the House Banking committee.