Vice President Joe Biden said he can't think of any good reasons why he shouldn't run for president in 2016.

In a speech to the United Automobile Workers conference on Thursday, Biden had joked that the only reason he wouldn’t launch a bid for the Oval Office was his love of cars — saying that he wanted to drive a new Corvette.

But in an interview with CNN aired Friday morning, Biden put joking aside and insisted there was no serious bar keeping him from a presidential run.

Asked by CNN’s Kate Bolduan for another “good reason” why he couldn’t run for president, Biden responded “I can’t.”

“There may be reasons I don’t run, but there’s no obvious reason for me why I think I should not run,” said the vice president.

Biden has long declined to close the door on a 2016 bid, despite polls showing former Secretary of State Hillary Clinton the clear front-runner for the Democratic nomination. Despite efforts from her supporters to lay the groundwork for a bid, Clinton has sidestepped questions about her plans.

The vice president said his own timetable for making a decision would be “realistically, a year” likely next summer.

Biden said he also said he would have the support of his wife, Dr. Jill Biden.

“When I ran the first time, Jill didn’t want to run again; the second time, she came to me and said ‘you’ve got to run.’ The reason she wanted me to run is because she was convinced if I ran, we’d end the war in Iraq and have a sounder foreign policy and she was convinced that if I ran, I would work like hell to make sure the middle class has a fighting chance,” Biden said.

“For me, the decision to run or not run is going to be determined by me as to whether I am the best qualified person to focus on the two things I’ve spent my whole life on: giving ordinary people a fighting chance to make it and a sound foreign policy based on the rational interest of the United States,” he continued.

“It doesn’t mean I’m the only guy who can do it,” Biden added. “But if no else I thinks can and I think I can, then I run. If I don’t, I won’t.”