(CNN) – Her husband has already made two bids for the White House, but Jill Biden said in an interview airing Thursday she wasn't ruling out a third attempt.
"I think Joe would be a great president. I supported him twice. In 1987, I was out there campaigning. The last election I was out there campaigning. Of course, Barack must have thought he would be a good president, too, or he wouldn't have chosen him as vice president," Biden told CNN's Soledad O'Brien on "Starting Point."
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Biden was echoing remarks she made earlier in the week, when she told NBC she "wasn't sure" if the 2012 campaign would be her husband's last.
The vice president, who would be 73 in four years, stirred speculation in October when he left the door open to a 2016 campaign.
"I'll make up my mind on that later," Biden said in an interview on CNN's "State of the Union." "I'm in one of the, probably the best shape I've been in in my life … I'm doing pretty well. I'm enjoying what I'm doing, and as long as I do, I'm going to continue to do it."
In her CNN interview, Jill Biden weighed in on a recent Pew study showing political polarization at a 25-year high. The second lady pointed to a shift in the Republican Party to explain the phenomenon.
"I think the parties are really disparate and probably the Republican Party has gone way far right than it has gone before," Biden said. "It certainly is not the Republican Party I grew up with."
The 2012 election, Biden said, would provide Americans a clear choice.
"I think that Mitt and Barack are on totally different paths," she said. "And, you know, you've got clear choices. That's what I think. Of course, I think our choice is the best."
CNN's Ashley Killough and Kevin Liptak contributed to this report.