Michigan proving too close too call...
From CNN - Tough talk testament to high stakes in Michigan primary
"The tough talk is indicative of the high stakes in Michigan. Romney has led nationwide polls off and on over the course of the campaign but hasn't been able to seal the deal. Santorum is the latest of Romney's rivals to challenge him for front-runner status by playing on conservatives' reservations about the former Massachusetts governor.
Santorum's hat trick earlier this month propelled him to a lead in national polls and a double-digit lead in Michigan two weeks ago. But he had a lackluster performance in last week's CNN/Arizona Republican debate and has fallen behind Romney in national polls and into a close race in Michigan.
Fifty-nine delegates are up for grabs in the two states vote but momentum will be the bigger prize.
"Mitt Romney's ferocious campaign against Santorum in Michigan is pivot point of the campaign," GOP strategist and CNN contributor Alex Castellanos said.
Both candidates have been spending most of their time in Michigan following the debate, and Castellanos says a Romney win there will greatly boost his campaign."