Paul Waldman: After all, they know, with every fiber of their beings, that Obama is deeply corrupt. He hates America, he's a racial avenger out to destroy white people, he's the embodiment of everything and everyone they despise. Yet somehow they can barely seem to lay a glove on him. So in their latest bit of acting out, Republicans in the House of Representatives are trying toimpeach Josh Koskinen, the commissioner of the Internal Revenue Service.