Over the past two weeks, presidential candidates and their allies have aired the most TV ads in Ohio, Florida and Virginia. These big three are home to a combined 60 electoral votes, and with less than a month until Election Day, Obama and Romney are spending the most time and money in them.

The way Republicans see it, Romney will have a much steeper climb winning the presidency without taking back all three from the Democratic column. And in the eyes of Obama's team, they can all but ensure a second term if they win just one of the battlegrounds. Read More