Washington (CNN) - As Mitt Romney faces a newly energized Rick Santorum, the super PAC supporting Romney, Restore Our Future, is weighing in this week with a major ad buy of more than $1.5 million, the group told CNN Tuesday.
Besides the $640,000 in additional ad time it bought in the key battleground of Michigan, which CNN reported Monday, the group also purchased an additional $121,000 in Arizona. Santorum has vowed to campaign aggressively in Michigan and in Arizona both of which vote in two weeks on Feb. 28th.
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As part of its new campaign, Restore Our Future purchased an additional $252,000 in campaign spots in Ohio. Because of its blue collar population, the Santorum campaign is viewing the Buckeye State as an attractive target where it thinks the former Pennsylvania senator can do well. It is the state with the largest number of delegates up for grabs on Super Tuesday, March 6.
The super PAC also showed its financial advantage by making buys in three other Super Tuesday states: $184,000 of broadcast, cable and radio time in Tennessee; $118,000 of broadcast time in Georgia; and $40,000 in broadcast time in Oklahoma.
Besides Michigan, the group's new ad purchases begin Wednesday. Restore Our Future is not saying if its ads will take aim at Santorum and/or Newt Gingrich or tout Romney. Most of its spots have been blistering criticisms of Romney's opponents with the chosen target depending on who was perceived as the major threat at the time.
Recently the super PAC has aimed its muscle solely at Gingrich because he was seen as the more dangerous opponent.
With the prospects of a Republican nomination fight going well beyond next month's Super Tuesday, the super PAC also purchased more than $150,000 of broadcast time in Alabama and Mississippi, both of which vote on March 13th. This could also be an attempt to preemptively try to weaken Gingrich in the region considered a key base for support.
Compared to the other super PACs supporting candidates, Restore Our Future has dramatically outraised and outspent them.
You can follow Kevin Bohn on Twitter @KevinBohnCNN.