Mitt Romney needled GOP rival Rick Santorum in an appearance on “The Tonight Show with Jay Leno” Tuesday, in an interview that focused largely on health care and other substantive issues.

Pressed on his possible picks for a running mate, Romney demurred, prompting Leno to initiate a word association game. Romney dubbed New Jersey Gov. Chris Christie “indomitable.” For real estate mogul Donald Trump it was “huge.”

And for Santorum, Romney doled out the phrase “press secretary,” playing off an uncomfortable interaction Santorum recently had with a New York Times reporter.

Romney also addressed apparently conflicting comments from Santorum, who has both assailed Romney as the “worst” Republican to take on the president but also said he would consider serving as vice president if Romney won the nomination.

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