Fox News has learned that Vice President Biden was "all over the place" in his first debate prep. A senior Democratic source said that is why top Obama campaign adviser David Axelrod and other senior aides "took over" the preparations.
The word is Biden is a little rusty after four years since his last debate.
But the campaign ran through at least six prep sessions, and top Democrats now say they are confident the vice president is ready to face Paul Ryan onstage Thursday night in Kentucky.
Fox News' Ed Henry contributed to this report.