Can this be argued. Nixon hired arm guards to rob the watergate XD. No reasonable argument can be made in his favor. Votes for Nixon will be based off of ideological hate for Obama, and not realism.
This is a very odd question considering what Jifpop mentioned and the fact he could have stopped the Viet Nam war sooner.
Nixon did something that... just about every president was at least suspected of doing. Obama had a few major fiascos: Benghazi, where 4 people DIED because of a failure to secure the embassy, and on top of that Obama's administration repeatedly LIED about it, the "Fast and Furious" incident, which resulted in 1 U.S. agent DEAD, and finally, using his executive powers to affect legislation, which is UNCONSTITUTIONAL. I will assume we all also know what a disaster the "Affordable Care Act" was. So, while people dislike Nixon for being involved in one crime, I don't think that that can trump Obama's constant failure to manage his administration, lying, and overall disastrous presidency.