RepublicanJohn McCain defeated DemocratBarack Obama in the state by 15 percentage points. Prior to the election, 17 news organizations had correctly predicted that McCain would easily carry the state, and virtually all polling indicated the same. Most news organizations called Tennessee for McCain immediately after the polls closed. McCain slightly improved upon George W. Bush's performance in 2004, despite the nation as a whole trending significantly Democratic in 2008. This was the first time since 1960 that Tennessee did not back the overall winning candidate in a presidential election. Furthermore, this was the first time it voted differently from swing state Ohio since 1944, and the first time it voted Republican while that state voted Democratic.
McCain became the first Republican to ever carry historically-Democratic Stewart County. As of 2020[update], this remains the last time that Houston County and Jackson County have voted for a Democratic presidential nominee or that the party has received more than 40% of the vote. It was one of five states to swing Republican from 2004, along with West Virginia, Louisiana, Oklahoma, and Arkansas.