Sen. John F. Kerry weighs in on the disappearance of Mark Sanford with a real knee-slapper.

WASHINGTON - A jovial U.S. Sen. John Kerry must have been channeling his inner Letterman Tuesday when he quipped the wrong governor had gone missing.

The Bay State Democrat was regaling a group of business and civic leaders invited to the Capitol on the bizarre disappearance of South Carolina Gov. Mark Sanford, who was said to be hiking the Appalachian Trail.

“Too bad,” Kerry said, “if a governor had to go missing it couldn’t have been the governor of Alaska. You know, Sarah Palin.”

(Hat tip: Andrew Malcolm.)