Died in 1946 AP

WASHINGTON - Lawmakers are going another round in their fight to get a posthumous presidential pardon for the world's first black heavyweight champion, who was imprisoned nearly a century ago because of his romantic ties with a white woman.

New York Rep. Peter King and Arizona Sen. John McCain, both Republicans, plan to reintroduce a congressional resolution urging a pardon for boxer Jack Johnson.

Another supporter, Rep. Charles Rangel, D-N.Y., said he will talk to President Obama's new chief of staff, William Daley, and Attorney General Eric Holder about the cause.

"It's an injustice that shouldn't fall through the cracks, and it looks like that's exactly what happened," Rangel said.

Johnson became the first black heavyweight champion a century before Obama was elected the nation's first black president. The boxer's flamboyant lifestyle and his relationships with white women inflamed white sensibilities.

Racial resentment boiled over after he defeated a white boxer in the "Fight of the Century" 100 years ago last summer. Three years later, Johnson was convicted of violating the Mann Act, which made it illegal to transport women across state lines for immoral purposes.

One of Johnson's great-great nieces, Linda Haywood of Chicago, is writing to Obama about the case.

"I think having a letter from a family member will help put a face on our plea," Haywood said. "Many people didn't realize he had nieces and nephews. For years, the rest of my family was so ashamed, no one ever spoke of him because of the stigma attached to him being in prison."

King said he was surprised Obama didn't act during the last session of Congress, when the House and Senate passed the resolution. But the congressman is still optimistic.

"With last year's elections, there seems to be a clear intent by the president to try to be more bipartisan," King said. "Everything is there to correct an historic wrong and also, in a small way but significant way, help to bring the country together now."

King and McCain, who both once sparred in the ring, also plan to send letters to Obama and name a separate boxing-reform bill for Johnson, who died in 1946 at age 68.

The White House declined to discuss the request for Johnson, citing a policy of not commenting on how pardon candidates are chosen. Obama, a former constitutional-law professor who once taught a class on racism and the law, has not spoken publicly of the Johnson effort, but the Justice Department has come out against it.

In a letter to King and McCain at the end of 2009, the Justice Department attorney who advises on pardons argued that resources for such requests are best used for those still alive "who can truly benefit" from them. That notwithstanding, he noted, Obama certainly could pardon whomever he wishes.

In 2010, Obama pardoned nine people convicted of crimes, including possessing drugs, counterfeiting and mutilating coins. None was well-known.

The fact that Johnson wouldn't personally benefit from the pardon is beside the point, argued another one of Johnson's great-great nieces, Constance Hines of Chicago.

"This is about righting a wrong," she said.