-Voter registration and turnout is going to be a key to this election, and President Obama is marking Ohio's deadline for registering with a 5 p.m. rally in Columbus. He will be joined by musician, enthusiastic Obama supporter and sometimes hologram Will.i.am.

-Joe Biden has no scheduled events; he will be preparing for his Thursday night debate with Rep. Paul Ryan, the Republican vice presidential candidate.

-Sesame Street becomes a campaign theme: After Mitt Romney told debate moderator Jim Lehrer that he would cut the government subsidy to PBS despite his avowed fondness for Lehrer and Big Bird, the Obama campaign released an ad mentioning Big Bird. Elmo also got a shoutout from the president during a fundraiser last night.

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