How presidential battleground states have changed over the years

The map of presidential battleground states has shifted since 2000, when Florida, Missouri, Tennessee, Washington, New Mexico and Oregon were among the most closely watched states.

Bret Baier is the chief political anchor for Fox News and the host of Special Report with Bret Baier. He is the author of five bestselling presidential biographies on Dwight D. Eisenhower, Ronald Reagan, Franklin D. Roosevelt, Ulysses S. Grant, and George Washington. 

Twenty-four years and six elections ago, Florida was a presidential battleground state, along with current solid Republican states like Missouri, Tennessee and West Virginia, and now-solid Democrat states like Washington, Oregon and New Mexico.

"Both [Texas Gov. George W. Bush and Vice President Al Gore] used these different campaign tactics and campaign memorabilia to kind of speak to certain voters," Museum of Democracy Chair Austin Wright said.