NASHVILLE, Tenn. – Former Vice President Al Gore and his wife, Tipper, are separating after 40 years of marriage that included a White House run when their sunny relationship offered a counterpoint to President Bill Clinton’s philandering.

According to an e-mail circulated among the couple’s associates on Tuesday, the Gores said it was “a mutual and mutually supportive decision that we have made together following a process of long and careful consideration.”