Making a prediction now for the rest of the campaign.
Romney campaign and PACs will outspend Obama on ads aimed at shaping public perception around Tea Party issues that energized Republicans in 2010. They will argue that Romney / Ryan will save Medicare while Obama has been destroying it with Obamacare. Exhibit A is Reince Priebus this Sunday. Exhibit B is the likelihood that the Republicans will be able to outraise Obama, the opposite of what happened in 2008.
We'll see...