By the numbers

Mitt Romney's 'huge' spending advantage: By the numbers

The GOP frontrunner barely beat Rick Santorum in the Michigan primary, but he certainly distinguished himself when it came to spending

Mitt Romney squeaked through Michigan's GOP presidential primary this week with a narrow, three-percent win over Rick Santorum. And the allocation of the state's 30 delegates was even tighter — both candidates emerged with 15, leading Santorum's camp to call the race a tie. But the campaign spending race wasn't even close, with Romney, once again, outspending his rivals by a mile. Here, a look at the Republican frontrunner's "huge" financial edge, by the numbers:

$4.3 millionAmount Romney and his super PAC, Restore Our Future, spent on TV and radio ads in Michigan. About $2.3 million of that went to TV ads paid for by Restore Our Future.

$2.3 millionAmount Santorum and his backers spent in the state. Most of the total — $1.3 million — came from the pro-Santorum super PAC, Red White and Blue Fund.

$242,205Amount that Priorities USA, a super PAC supporting President Obama, spent on ads attacking Romney

$49,999Amount Ron Paul spent in Michigan

$659,779Amount the pro-Romney Restore Our Future spent on Tuesday's primary in Arizona, which Romney won handily. His campaign spent nothing.

$52,114Amount Santorum spent in Arizona

5Dollars Romney spent in Florida for every $1 spent by Newt Gingrich, who, after a victory in the South Carolina primary, was then Romney's biggest rival

3 Dollars Romney spent for every $1 Gingrich spent in Iowa, where Romney and his allies "buried" the former House speaker with negative ads

$38 millionTotal campaign spending by Romney and his "pet" PAC to date

$9.7 millionTotal spent by Newt Gingrich and the super PAC supporting him

$6 millionTotal spent to date by Santorum and his super PAC, the Red White and Blue Fund

$6.5 millionAmount Romney raised in January

$32 millionAmount Barack Obama raised in January 2008, when he was locked in a Democratic primary battle with Hillary Clinton

Sources: Hot Air, Politico, Telegraph, Wash. Post

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