Check out this old anti-Santorum ad that ran during his last Senatorial campaign in 2006.
I mean…wow. Simple, direct to the point, devastating. I haven’t seen any candidate running this line of attack against Santorum in 2012, but this seems really easy to tie into the earmarks-related attacks Romney is currently running against Santorum in Michigan. The basic hook would be “Rick Santorum voted for the Bridge to Nowhere but against adequate body armor for our troops.” This could be part of a whole series of attack ads based on Santorum’s lack of proper priorities: “Rick Santorum keeps talking about culture wars bullshit while unemployment is at 8.3%” or “Rick Santorum introduced 2948750 bills to ban pornography but not one to cut taxes” et cetera. From there it’s really easy to just go full negative with a punchline like “Rick Santorum: Wrong Priorities, Wrong for America” or alternatively, pivot to positives about your guy: “We need a candidate who understands what’s really important. Vote (insert candidate).”
This is one of those times I wish I was back in college and had the resources to just go ahead and make these ads. Would be fun.