Democrats supporting Santorum?

Republican presidential candidates Rick Santorum (left) and Mitt Romney at the CNN Republican Presidential Debate in Mesa, Arizona on February 22, 2012.
Republican presidential candidates Rick Santorum (left) and Mitt Romney at the CNN Republican Presidential Debate in Mesa, Arizona on February 22, 2012.

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    Democrats supporting Santorum?

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Democrats supporting Santorum? 01:27

Some Michigan Democrats have committed to vote for Santorum in an attempt to hurt Romney. Dana Bash reports.