Gays are growing angry with President Obama's opposition to same-sex marriage. David Mixner, a leading gay activist who also fought former President Clinton over "don't ask, don't tell," has shifted from pushing Obama to support gay marriage to labeling him as a coward. Calling same-sex marriage "one of the great civil rights movement[s] of our times," he says Obama's stance is unacceptable. "At this stage there can only be two conclusions: that he is a political coward or that he does indeed hold prejudice against [lesbian, gay, bisexual and transgendered] citizens," Mixner says on his website. "Shame on you, Mr. President," he adds, in an attack Obama associates say won't change the president's mind.