Jack Carter, who ran unsuccessfully for U.S. Senate in Nevada last fall, has endorsed Sen. Joe Biden to be the Democratic nominee for president. Carter, the son of former President Jimmy Carter, seemed to snub Illinois Sen. Barack Obama for his lack of experience and New York Sen. Hillary Clinton for having high unfavorable ratings in polls. "With Joe Biden, we don't have to worry about the problems of lack of experience or high negatives affecting our chances in November 2008," Carter, 60, said in a statement released by the Biden campaign Monday. "I'm very comfortable that he can win."...