Barack Obama's campaign to become the Democratic presidential candidate received a boost on Friday when he gained a key endorsement.

New Mexico Gov. Bill Richardson, who gave up his own bid for the nomination in January, put his support behind Obama, saying the Illinois senator is a "once-in-a-lifetime leader." Both candidates relentlessly courted Richardson.

Richardson — who once served under Bill Clinton's government — called the former president's leadership "enlightened," but said "it is now time for a new generation of leadership."

He is the only Hispanic governor in the U.S. and his endorsement is expected to boost Obama's support among that demographic, one that typically has rallied behind Clinton.

"[Obama] understands it clearly that by only bringing people together and by bridging our differences can we succeed together as Americans," Richardson said at a rally in Oregon alongside the Illinois senator.

Richardson also praised Obama for demonstrating leadership abilities in this week's speech on race.

He commended Obama for not waiting for the controversy over comments made by his former pastor, Rev. Jeremiah Wright, to subside, instead addressing the issue head-on.

In Tuesday's speech in Philadelphia, Obama sought to appease public anger over inflammatory remarks made by his religious mentor of more than 20 years.

In some of Wright's sermons to his congregation at Chicago's Trinity United Church of Christ, he suggested America was perhaps responsible for inciting the Sept. 11, 2001, attacks.

With files from the Associated Press