"Obama 'knows this is going to be a close race' and 'feels that Democrats very well could lose' the contest, a source familiar with the former president's thinking told The Wall Street Journal.
"What I worry about, you guys, from a Biden standpoint, is these are the kinds of things you get when people are starting to rationalize their votes."
A mix of polls show Biden, 81, down both nationally and in battleground states, with voters expressing considerable concern about his age.
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