PBS host Jim Lehrer was challenged Friday morning on claims that he went easy on Sen. John Kerry during Thursday night's presidential debate, while tossing verbal hand grenades in President Bush's direction designed to keep him on the defensive. PBS host Jim Lehrer was challenged Friday morning on claims that he went easy on Sen. John Kerry during Thursday night's presidential debate, while tossing verbal hand grenades in President Bush's direction designed to keep him on the defensive. "I don't know what in the world you're talking about," Lehrer told radio host Don Imus, in his only post-debate interview. "I...