Santorum: Convention would give me GOP nomination

But Santorum can't match Romney in money and organization.

"We're playing catch-up," he said. "That's what happens when you compete in every state and you don't have the resources of everybody else."

Romney's campaign plus an allied campaign committee run by former aides is spending more than $2.5 million on TV ads in Alabama and Mississippi. Santorum's campaign has few commercials there, though a separate campaign committee that supports him is spending around $500,000 on advertising.

Santorum also discounted Romney's appeal within the party.

"They are not going to nominate a moderate Massachusetts governor who's been outspending his opponent 10-1 and can't win the election outright," Santorum said on NBC's "Today." ''What chance do we have in a general election if he can't, with an overwhelming money advantage, be able to deliver any kind of knockout blow to other candidates?"

"We're going to be the nominee," Santorum said, adding later. "Gov. Romney will not make it."

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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