Well if you think about it Watergate did absolutely nothing to impact his reelection. They were just playing spies without any realistic plan (yes they wanted McGovern to win the primaries with the idea that he would be an easier opponent for Nixon to beat). The coverup was just another bunch of crimes still related to their useless plot. Nixon did send the IRS after anti-war activists. Yes he bombed Cambodia (Robert McNamara's plan) and lied to the American public and Congress about it, but remember that the entire Vietnam war was started as a "police action", war was never declared and Congress never had the ability to vote on it. The entire war was illegal and not started on Nixon's watch. It was GW Bush who started America's longest and most useless war. Of course Wikipedia and other sites list the Vietnam war as longer, but the extra decade they are counting is way before any American military troops were sent.
Nixon was an avid law-breaker, but not a blathering moron. Because Trump is an idiot, he may accidentally start WWIII, cause irreversible damage to the planet, send the economy spiraling into a downfall we won't recover from, or might unwittingly do some good things, broker peace between the 2 Koreas (doubtful, but who knows?). With Trump we are all forced to be potential victims in a game of Russian roulette.