Lance Armstrong, riding a bicycle earlier this year (Getty Images)

The embattled cyclist Lance Armstrong, undergoing scrutiny after the U.S. Anti-Doping Agency's report of his and his teammates' use of performance-enhancing drugs, has resigned as head of the Livestrong charity, which rose to prominence in the mid-2000s for selling yellow rubber wristbands. (Presidential candidate John Kerry wore one throughout the 2004 campaign.)

Mr. Armstrong's ardent defender, Buzz Bissinger of the Daily Beast and Newsweek, has been silent thus far today, though he recently called both Mr. Armstrong and Republican Presidential nominee Mitt Romney "huge dongasauruses" who attract criticism.