WASHINGTON -- For nine years, a pair of Capitol Hill lawmakers have asked the president of the United States to posthumously pardon American boxing legend Jack Johnson.

President George W. Bush failed to act, but in 2009 the congressmen thought they might be able to convince the nation’s first African-American president to do so on behalf of the world’s first African-American heavyweight boxing champion. But President Barack Obama hasn’t issued a pardon either, and his administration says it’s unlikely he will.

That isn’t stopping the lifelong boxing fans from trying again.

Republicans Sen. John McCain of Arizona and Rep. Peter King of New York, now joined by two Democrats, again introduced a congressional resolution last week calling on Obama to pardon Johnson a century after his racially motivated conviction of taking a woman across state lines for immoral purposes.

“As we look back on our nation’s history, the Jack Johnson case is a shameful stain, apparent to all,” McCain said recently. “Rectifying this injustice is long overdue.”

The Justice Department, however, generally doesn’t consider pardons for people after they die, according to department guidelines. Those investigations are lengthy and complex, and the department would rather spend its resources on the pardon and commutation requests of living people, the guidelines say.

“It is the department’s position that the limited resources which are available to process requests for president clemency – now being submitted in record numbers – are best dedicated to requests submitted by persons who can truly benefit from a grant of the request,” pardon attorney Ronald Rodgers wrote to King in December 2009. The pardon attorney, at Justice, assists the president in the exercise of executive clemency.

Posthumous pardons are extremely rare but they have been granted.

In 1999, President Bill Clinton pardoned Lt. Henry O. Flipper, the Army’s first African-American to graduate from West Point, who’d been forced out of the military in 1882 after white officers accused him of embezzling commissary funds. In 2008, Bush pardoned Charles Winters, who’d been convicted of violating the Neutrality Act in 1948 by helping to transfer two B-17 aircraft to Israel.

The White House referred questions about Johnson to the Department of Justice. A Justice spokesman didn’t comment except to say the department doesn’t have a pending application for Johnson.

Johnson, born to former slaves in Texas, was initially denied the right to fight professionally because of his race. When he was finally granted the opportunity, he defeated the title holder to become the first African-American heavyweight champion. He reigned over the boxing world from 1908 to 1915 before losing his heavyweight title to a white fighter – Jess Willard – in Havana, Cuba, in 1915. But he kept his influence over the boxing world, including future fighter Muhammad Ali.

Johnson’s success in the ring – and indulgent lifestyle – prompted resentment as well as a search for a white boxer who could defeat him, dubbed the “great white hope.” After Johnson defeated a white champion who’d returned from retirement to fight him, race riots broke out in several cities.