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(USA TODAY) -- Vice President Biden says it's too early to decide whether he will run forpresident in 2016 -- there's too much left to do under President Obama.

"There are a whole lot of reasons why Iwouldn't run," Bidentold CNN. " I haven't made that decision and Idon't have to make that decision for a while."

The veep added: "In the meantime, there's onething I know I have to do no matter what I do. I have to help this presidentmove this country to the next stage."

Speculation about Biden's political futurehighlighted inaugural weekend.

Biden himself fueled much of the talk, thanks to his appearance at aninaugural party for Iowans -- who will open the 2016 contest with caucuses -- tohis animated hand-shaking during Monday's parade on Pennsylvania Avenue.

One factor in Biden's decision: Will soon-to-depart Secretary of StateHillary Rodham Clinton also seek the presidency in three years?

"Look, I haven't made that judgment and Hillary hasn't made that judgment,"Biden said on CNN. "But I can tell you what, everything that should be done overthe next two years that I should be part of would have to be done whether I runor I don't run."

Again, he noted: " If this administration is successful, whoever is runningas a Democrat is better position to win. If we are not successful, whoever runsas a nominee is going to be less likely to win."