[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/08/18/art.ohio.cnn.jpg caption="Ohio is expected to be a battleground state, as it was in 2004, above, when President Bush carried the majority of counties but only won by 100,000 votes."](CNN) - John McCain will hold a large rally in Ohio and possibly two other battleground states August 29 - the day after Barack Obama formally accepts the Democratic presidential nomination and the same day the Arizona senator is expected to name his running mate, Republican and McCain campaign sources tell CNN's John King.
The McCain campaign is hoping to have 15,000 people at the Ohio rally - roughly 5 times the size of McCain's largest crowd to-date.
Two other rallies are also in the works for that day, likely in Michigan and Pennsylvania.
Campaign sources say the events are not necessarily designed to name a vice presidential candidate, though McCain's VP shortlist is thought to include politicians from all three of those states: Former Ohio Rep. Rob Portman, Michigan native Mitt Romney, and former Pennsylvania Gov. Tom Ridge.