WASHINGTON--President Barack Obama and rival Mitt Romney are both on battleground state bus tours on Tuesday: Obama is in Iowa and Romney is on an Ohio swing.

New Romney runningmate Rep. Paul Ryan vaulted from Iowa--where on Monday he shared the state with Obama on his first day of solo stumping-- to battlegrounds Colorado and Nevada. Ryan in Denver also headlined fund-raisers in Denver.

Vice President Joe Biden is in Virginia on Tuesday--another swing state.