Santorum laughs off Romney in Michigan

Rebecca Kaplan asked Rick Santorum if the Michigan primary is "must win" for his campaign.

• 2012-02-29T21:02:15+00:00
• Duration: 00:13

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News & Politics, washington , unplugged , mitt , romney , michigan , primary , rick , santorum , arizona, gop , nominee , republican , cbs2012 , john , dickerson , wuclips,