When people said false things about Obama or had exaggerated fears, John McCain corrected the falsity and tamped down the fears. Donald Trump on the other hand, spreads falsehoods and stokes unbased fears.
Unbased fears and falsehoods are a natural part of society. Responsible leaders tend to correct falsehoods and tamp down unbased fears. Irresponsible leaders stoke them.
Obama was handed the worst economic circumstances in a long time, and the other party in a two-party system gathered and explicitly decided to stand against him on everything–a full court press.
Obama deeply wanted bi-partisan healthcare reform, but Republicans refused to play ball. Maybe if some of them did, we could have got a better reform.
Obama made some basic comments about an older black man being arrested while trying to get into his own home, and the right exploded, calling Obama racist and saying he had a problem with white people.