A stumper for GOP candidate: Who's the greatest living president?

“Obviously the greatest president of my lifetime is Ronald Reagan,” said Louisiana Gov. Bobby Jindal.

“I’ll leave that to the people to decide,” said Texas Sen. Ted Cruz, which is his guaranteed go-to line for questions he doesn’t want to answer. “Certainly the greatest president of recent generations was Ronald Reagan.”

“I was a big fan, a very big fan of Ronald Reagan,” real estate mogul Donald Trump said.

Ronald Reagan, as you might recall, has been dead for 11 years.

There are reasons why these White House hopefuls are suddenly shy when pressed on their thoughts about the five surviving presidents.