In addition our elections are far from squeaky clean, what's the last one we had that didn't have major controversy or accusations of fraud?
Major controversy doesn't necessarily mean the election wasn't clean. Nor do accusations of fraud mean anything unless there actually was fraud.
This isn't really a bad thing, because it encourages independent thought and stops parties from establishing long reigns of power.
let's not forget that no President has ever been reelected.
To be fair, only one president has ever run for re-election in the first place.