Alex Burns reports how much more money Mitt Romney's campaign and super PAC spent in Illinois than Rick Santorum's.

"Rick Santorum’s campaign and super PAC have been outspent by a margin of 7 to 1 in the Illinois primary, with forces supporting Mitt Romney shelling out a total of about $3.7 million on the airwaves, according to a GOP media-buying source," Burns writes.

"Romney’s campaign has spent $1,117,704 million in Illinois while the super PAC Restore Our Future has put in $2.556,353 million. The Santorum campaign spent a comparatively modest $219,961 and the super PAC backing Santorum, the Red White and Blue Fund, put in $312,150."

Romney leads in Illinois polls. According to the RealClearPolitics average, Romney has an average of 41 percent, Santorum 31 percent, Newt Gingrich 13.3 percent, and Ron Paul 8.3 percent.

The greatest spending discrepancy comes in the Chicago media market. "The gulf was even more enormous in the crucial, expensive Chicago media market," Burns reports. "There, Romney’s campaign spent $710,158 and his super PAC spent $1,367,125. The only pro-Santorum spending was $97,119 from the campaign. ... That amounts to a spending disparity of 21 to 1 in Romney’s favor."

The Illinois primary is being held today.

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