Of course the GOP will challenge Obama's leadership (granted, mostly symbolic) in gun control. They think unfettered gun ownership is more important than keeping your kids alive.
These are the same people who are violently against a government that can give aid in a disaster - until its their state that needs aid. But they're not entirely hypocritical: they're still willing to vote against aid for other states.
GOP. Genuinely Outrageous Politicians -- and proud of it.