Mainly just abortion-rights, gun-rights and LGBTQ-rights. Either way, one or the other is trying to screw you over by taking your [insert right here] away.
Abortion yes, but I'd debate the other two.
Remember, Bush supported tightening background checks and increasing the age of owning a gun to 21. Conservatives have gotten a lot more rigid in their refusal to have gun control of any kind, compared to the early 2000's. Bush would be considered downright liberal by a lot of them if he were president today. And with gun sales higher than ever, it's not like Obama's done anything to impede gun ownership in reality.
Obama did basically nothing to support LGBT rights. He remained gutlessly non-commital about SSM until the Supreme Court ruling and then rushed in to claim the glory. While it might be true that Bush wouldn't have approved it if it'd hit his desk, I'm not 100% certain Obama would have either if it'd been his first term and he had another election to win, so in real terms they weren't really any different.
Obama repealed DADT, yes, but you have to keep this in the context of the time. For its time, DADT was actually lauded as an improvement for gay people, even by
some gay people, for a variety of reasons. A compromise, yes, and even at the time some disagreed that it was good enough, but still an improvement. I know a lesbian who served and welcomed DADT with open arms, back in the 90's -- it was protection from assault, as far as she was concerned. That was still sort of true in the earlier years of Bush's presidency.
Obama and Bush look a bit different on paper
, when it comes to gun control and LGBT rights. In real terms, it's made very little difference.
Their greatest sins were actually in the same arena: their complete lack of respect for Americans' privacy or rights within the justice system, or any sort of transparency in their administrations. This is one of the few remaining areas where Republicans and Democrats tend to work together.
I've gotten to the point of realization that apart from military matters, who's president doesn't make all that much of a difference. Who's in Congress is far more important, and people seem to pay a lot less attention to that.