(Reuters) – Two senior U.S. senators welcomed a petition launched by former boxer Mike Tyson to have heavyweight champ Jack Johnson posthumously pardoned by President Barack Obama for race crimes a century ago. Democratic leader Harry Reid and Republican John McCain, longtime Johnson supporters, joined fellow boxing champions Lennox Lewis and Laila Ali, the daughter of retired boxing legend Muhammad Ali, in backing Tyson's petition on grassroots campaign website Change.org. The petition says Johnson, the first black heavyweight boxing champion of the world "is long overdue a pardon. …
