The pioneering TV host Phil Donahue, who revolutionized daytime television by tackling major social and political issues in front of a studio audience, has died at the age of 88. The Phil Donahue Show, later renamed Donahue, ran from the 1960s through to 1996, and the affable host won 20 Emmy Awards and received a Peabody Award throughout his career. In 2003, Donahue was fired from his primetime…