Former Pennsylvania senator Rick Santorum frequently says that money doesn’t guarantee victory.

That claim will be put to the test Tuesday night in Michigan, where former Massachusetts governor Mitt Romney and his allies have outspent Santorum and his supporters $3.8 million to $2.2 million on television ads.

Romney has a sizable spending advantage. (Justin Sullivan/Getty Images)

When you bring in radio ads, Romney’s advantage is $4.27 million to $2.3 million.

That isn’t as sizeable as the 5-to-1 spending edge Romney and supporters enjoyed over former House speaker Newt Gingrich in Florida or his more than 3-to-1 edge in Iowa, when he and his super PAC allies buried Gingrich in negative ads. But it’s still a significant advantage.

It’s the first primary in which Romney and Santorum have truly butted heads. Romney largely ignored the Minnesota and Missouri caucuses earlier this month, where Santorum pulled off surprise victories.

Polls show that Romney, after falling behind, now has a slight edge in Michigan and a comfortable lead in Arizona.

The breakdow


The pro-Romney super PAC Restore Our Future spent $2,307,082 on Michigan TV ads, according to a Republican media buyer, while Romney himself put $1.5 million into the state. The pro-Santorum Red White & Blue Fund spent $1.3 million on TV in Michigan, with Santorum’s own campaign spending $882,786.

Meanwhile, no one has seriously tried to compete with Romney in Arizona. Restore Our Future spent $657,779; Romney’s own campaign spent nothing. Santorum spent a mere $52,114.

Neither Gingrich nor Texas Rep. Ron Paul competed in either state, although Paul did drop $49,999 on Michigan ads.

Priorities USA, a super PAC supporting President Obama, also spent $242,205 in Michigan on an ad attacking Romney.