GOP presidential candidate Mitt Romney is staying tight-lipped about his coming running mate selection, but that hasn’t stopped intensifying speculation over the decision.

“I have nothing for you on the vice presidential question,” Romney said when asked if he had made up his mind during an interview aired Sunday on CNN’s State of the Union.

“I give you nothing on that. But I can assure that by the third day of the Republican convention we will nominate a Republican VP,” he added.

But other political heavyweights are placing their bets on who will join the GOP presidential ticket.

South Carolina Sen. Lindsey Graham (R) placed his money on former Minnesota Gov. Tim Pawlenty (R) and Ohio Sen. Rob Portman (R),

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