Sen. Tim Kaine, D-Va., is proud to be Hillary Clinton’s running mate this year, but there was a time when his political ambitions in Virginia made supporting her an uncomfortable proposition.

In 2005, Kaine ran for governor after serving as lieutenant governor under Mark Warner. Just one year after George W. Bush carried Virginia for the second time, Kaine was asked during a gubernatorial debate if he would back Clinton’s 2008 presidential bid.