NEW YORK (AP) — Hillary Rodham Clinton has already had to forgo one potential running mate — her husband.

Asked by talk-show host David Letterman if Bill Clinton could serve as her vice president should she be elected to the White House, the former first lady acknowledged that he could not.

"Believe me," she joked, "he looked into that."

She also remarked that if the Constitution didn't forbid a president from a third term, "he might be running."

Such easy banter marked Clinton's seventh appearance on "The Late Show," which was celebrating its 14th anniversary on CBS. She first appeared on Feb. 14, 1994, when Letterman's mother, Dorothy, interviewed her briefly from the Winter Olympics in Norway.

On Thursday's show, Clinton recounted a summer in Alaska during which she donned boots and an apron to gut salmon with a spoon.

"Best preparation for being in Washington that you can possibly imagine," she joked.

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