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(CNN) — Joe Biden held a campaign rally in Lee's summit Missouri earlier Monday, the first of the Democratic VP candidate's last four rallies.

Introducing Biden, Missouri Sen. Claire McCaskill took a shot at Republican VP candidate Sarah Palin.

"Barack Obama chose the very best person in the country that could be president of the United States. And well, let's just say John McCain didn't," she said.

Biden also has stops in Ohio and Pennsylvania Monday.