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Interest has peaked in the primary, with Romney's campaign hoping to hold the state that he grew up in and in which his father served as governor. Romney has poured millions of campaign dollars into protecting the state, expected just weeks ago to be an easy win.

The next week should be a volatile one, with Romney and Paul airing new commercials in the state knocking Santorum. Santorum and a super-PAC supporting President Obama, meanwhile, will go up with ads critical of Romney.