In this combo made from file photos, President Barack Obama, left, and Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, are shown. (AP Photo/Carolyn Kaster, Evan Vucci, File)
Presidential race is most costly ever
The battle between President Barack Obama and Republican Mitt Romney will be the most expensive presidential contest ever — by a long shot.
Search for Romney running mate goes on
Obama birth certificate OK in Arizona
Obama, Dems redoubling money efforts
