There are corrupt politicians in both parties.
When a corrupt Democrat abuses power a lot of people benefit, and a few people Really benefit. When a corrupt Republican abuses power, A few people really benefit, and a select few REALLY REALLY benefit.
Consider Clinton and Bush. The worst thing Clinton did was he didn’t pass a single payer / Medicare law and create a universal health care system. The worst thing he is known for is “hooking up” with a young woman to whom he was not married. The worst things Bush did were destroy the economy, invade Iraq, mire us in Afghanistan, ram the Patriot Act thru Congress, ignore the FISA law on wiretaps, suspend habeus corpus, outsource the military to his friends, botch the emergency response to Katrina and Rita – those things are so much worse than an inappropriate relationship between consenting adults, even tho one had significant power over the other.
One difference is scale. Clinton’s affair with Lewinsky should have been a private matter; it should not be a public matter. It did not, or should not have effected policy. Every one of Bush’s failings is a policy failure that profoundly diminshed the strength, health and well-being of the United States and many citizens.