Washington (CNN) - The war of commercials from the presidential campaigns and various super PACs supporting candidates is expected to intensify in the coming days and to greatly expand in its scope.
Mitt Romney's campaign has now bought almost $1.2 million in ad time in Michigan, a source who tracks media buys told CNN. So far the campaign has up a positive spot in the state where the candidate talks about his Michigan roots. His campaign did not respond to a request for comment regarding its ad strategy.
With Rick Santorum vowing to vigorously compete in Michigan, which votes on Feb. 28th, the state will be a major focus of activity with all sides knowing the outcome there will be a key factor in determining how the race unfolds.
Santorum's campaign went up with its third spot in Michigan Wednesday going after Romney after releasing two positive ads in the state on Tuesday.
So far the campaign's ad purchases in the state have been small.
The Santorum team is planning on expanding its ad presence there and in other key states hoping it can start introducing the former Pennsylvania senator and also pre-empt attacks coming from the tremendous financial and organizational advantage enjoyed by the Romney team and the super PAC supporting him.
In the next several days, the Santorum campaign said it plans to start airing commercials in Arizona, which also votes on Feb. 28th, as well as key Super Tuesday states Ohio, Georgia, Tennessee and Oklahoma, according to senior campaign officials John Brabender and Alice Stewart.
Romney is getting a major boost from that well-funded super PAC supporting his candidacy, Restore Our Future. This week it bought $1.5 million in commercials in Michigan, Arizona, Ohio, Tennessee, Georgia and Oklahoma but also moderate buys in March 13th states of Alabama and Mississippi.
The group on Wednesday started airing an ad criticizing Santorum as a “Washington insider” in Michigan, Arizona and Ohio.
The super PAC backing Santorum, the Red, White and Blue Fund, will try to minimize the impact in Michigan. It will announce on Thursday it is launching a "substantial" ad buy in Michigan, its spokesman Stuart Roy told CNN. He did not provide further details.
Santorum will need the help in order to combat the dual barrage from Romney and his allies.
Newt Gingrich currently has no ads running. Winning Our Future, the super PAC supporting Gingrich, will launch a national radio campaign on Thursday but has no plans for television buys, according to its spokesman Rick Tyler