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Steven Senne, File, Associated Press
FILE - In this March 23, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Metairie, La. The unemployment rate doesn't matter to Rick Santorum. Newt Gingrich has “more baggage than the airlines.” Both are compromised Washington insiders who have bent their principles for money and influence. So say Mitt Romney and his allies.

MILWAUKEE — On Wisconsin TV, Rick Santorum is getting pummeled as someone who doesn't understand the economy. On the radio, he's portrayed as squishy on funding for women's health care provider Planned Parenthood. In mailings, Santorum has "crazy ideas" that should be rejected in the GOP presidential primary in Wisconsin next week.

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Yet again, Santorum finds himself on the short end of a lopsided ad battle with rival Mitt Romney and his deep-pocketed allies.

Santorum and his allies are calling the prospect of a Romney nomination a "disaster," but their counterpunches aren't landing with the same power.

Wisconsin's primary is deemed the most competitive of Tuesday's three elections, drawing far more interest than races in Maryland and Washington, D.C. That's translated into nearly $4 million in ad spending in Wisconsin so far.