Watch CNN Bill Richardson Explains His Endorsement Of Barack Obama

CNN- Facing fire from some fellow Democrats for his decision to endorse Sen. Barack Obama, Gov. Bill Richardson said Sunday he still considers himself loyal to the family that helped make his political career. "I am very loyal to the Clintons. I served under President Clinton. But I served well. And I served the country well. And he gave me that opportunity," Richardson told "Fox News Sunday." "But you know ... it shouldn't just be Bush, Clinton, Bush, Clinton," he said. Richardson was secretary of energy under the Clinton administration, a post that helped bring him to national prominence and win the governorship of New Mexico in 2002. Richardson, who abandoned his presidential bid January 10, endorsed Obama on Friday as the Democratic nominee. He called Sen. Hillary Clinton Thursday to tell her of his decision, Clinton's campaign said. Watch what was behind Richardson's decision » The Clinton campaign shrugged off the endorsement. "Both candidates have many great endorsers, but the voters, not endorsers, will decide this election, and there are still millions of voters in upcoming contests who want to have their voices heard," Clinton spokesman Jay Carson said. Richardson was asked Sunday about James Carville's comment that Richardson's Obama endorsement "came right around the anniversary of the day when Judas sold out for 30 pieces of silver." Carville is an adviser to Clinton's presidential campaign and a CNN political analyst. "Well, I'm not going to get in the gutter like that," Richardson said. "And you know, that's typical of many of the people around Sen. Clinton. They think they have a sense of entitlement to the presidency."