If Mitt Romney wins the Republican nomination for president, he'll face the urgent task of inspiring the party's conservative core and rallying them to beat President Barack Obama.
Judging by his performances so far, he's got his work cut out for him.
Even Republicans who think he'll be the nominee worry about whether he can generate the intensity to beat Obama.
Party leaders and activists say Romney has made strides. But, they say, he needs to do more to convince the Republican base that he's running to fundamentally reverse the nation's course.
Romney leads in the delegate count for the nomination. But the challenge from former Pennsylvania Sen. Rick Santorum in Michigan going into the Feb. 28 primary, points to doubts about Romney's ability to ignite the GOP base.
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