Nobel Prize-winning author Toni Morrison has endorsed Sen. Barack Obama for president, calling him "the man for this time." "You exhibit something that has nothing to do with age, experience, race or gender and something I don't see in other candidates," Morrison wrote in a letter released by Obama's campaign. "That something is a creative imagination which coupled with brilliance equals wisdom." Massachusetts Sen. Edward Kennedy also endorsed Obama yesterday at a rally at American University in Washington.Morrison said this is her first public endorsement of a presidential candidate. She might be having second thoughts about having described Bill Clinton a decade ago as the "first black president," said Ronald Walters, a professor at the University of Maryland in College Park.