DENVER, Colorado (CNN) - Call it the battle of rallies.
Barack Obama campaign sources told CNN's Gloria Borger and Jessica Yellin that Obama and his running mate, Joe Biden, will have their first post-convention joint rally Friday, likely in Pennsylvania.
That's the day after Obama gives his presidential nomination acceptance speech, wrapping up the Democratic National Convention in Denver.
And it's also the same day that John McCain is expected to hold a rally in Dayton, Ohio. The conventional wisdom is that the Ohio event could be the first public appearance of McCain and his yet to-be-named running mate.
Obama sources say the joint appearance by Obama and Biden could be a good way to counter-program the Republicans.
They also said that one state Biden will be visiting frequently is Florida.
Sources also tell CNN that the presidential nomination roll call will take place on Wednesday from late afternoon into early evening.
Both Obama and Hillary Clinton's names will be on the roll call of delegates.
And CNN also hears that director Steven Spielberg is making a video that will air on Wednesday night at the convention hall at the Pepsi Center in Denver.
The video is about military veterans, and fits with the convention's theme of the night, which is a salute to veterans.