I never understood Republicans' opposition to Obamacare in the first place. Did they have specific policy criticisms or was it simply the fact that Obama championed it?
Obama did it federally. That's their real gripe with it.
Other than that, it's Romneycare on a federal scale with better cost-cutting measures--which is GOP as hell. They made an argurment against their own baby, slapped Obamas name on it, and now realize they can't really replace their own idea with anything better. Partisan fuckery at its finest/worst