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“We just gave Mitt Romney the fight of his life in his home state and now we are in for a long, important battle to the convention,” Mr. Santorum said in a fundraising email to supporters in which he reminded voters that he will need to raise lots of money to compete in the 10 states that vote in six days. “We had a great fight in Michigan, but we can’t let up. Now is the time. Let’s do what Americans always do when faced with a challenge — we fight.”