Before the Aurora tragedy, the Democrats had momentum on Romney’s tax returns and the Republicans had momentum on the President’s line about infrastructure and building businesses.

With Aurora likely to dominate the news for a long while and the Olympics and Romney’s overseas trip coming up, which side — if either — can revive their line of attack, soon or ever?

And given the inability to drive an earned media negative message, does it make sense to keep at it on the paid TV ad side at this point?