Uhhhhh... Not involved in scandalous behavior that you knew of, perhaps. Fast&Furious [0] would have been a major scandal in a Republican administration (despite the fact that it was started by a previous president), and the killing of Anwar al-Awlaki [1] was a massive step in the erosion of civil liberties in the US. These are just off the top of my head, I'm sure that there are others.
Not to say that Obama was a bad president, but "no scandals I've heard of" and "no scandals" aren't quite the same thing.
0: https://en.wikipedia.org/wiki/ATF_gunwalking_scandal#2009%E2...