Mitt Romney and his supporters are spending more than $4 million in the battle for next Tuesday’s must-win Michigan primary, funding a barrage of negative attack TV ads aimed at Republican presidential rival Rick Santorum.

But the spending spree is nothing new for the Romney campaign, which spent $18.8 million in January, while a pro-Romney super PAC dished out nearly $14 million in Florida, 20 times the amount spent by any other group — mostly for attack ads against Newt Gingrich.

Overall, the Romney campaign has spent more than $55 million as of early February, with negative advertising accounting for much of that amount.

Yet Romney doesn’t have a lot to show for all that spending. Of the nine GOP primaries and caucuses held so far, the former Massachusetts governor has won just four. Santorum, meanwhile, pulled off stunning victories in three states on Feb. 7, winning the Missouri primary and caucuses in Minnesota and Colorado.

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