Presidential candidate Mitt Romney might want to talk at length, clearly and forcefully, about the Supreme Court's ObamaCare ruling. Especially given that this is still on his campaign web site under the heading "Courts and the Constitution."
Justice Roberts' vote to uphold ObamaCare can be explained, but that's not the end of the story.
I think Romney's biggest problem isn't with the constitutionality of ObamaCare, which he has already addressed substantially. His problem is in the philosophical details of any kind of government takeover of healthcare and in the implementation of this one through health care "exchanges," a heinous bureaucracy capable of doing much more damage than even the individual mandate.
Federal funding has already been distributed to the states to set up these exchanges, of which Romney has gone on record in support. Don't think the Obama campaign will fail to let that detail slip out a few times before November.