Mark Wilson carries a rainbow flag during San Francisco's 42nd annual gay pride parade on Sunday, June 24, 2012. Organizers say more than 200 floats, vehicles and groups of marchers took part in the parade. (AP Photo/Noah Berger) Photo: Noah Berger, Associated Press

Revelers with balloons create a human rainbow during San Francisco's 42nd annual Gay Pride Parade on Sunday, June 24, 2012. The sidewalks of downtown San Francisco were crowded with colorful revelers on Sunday as the city marked its 42nd year celebrating the lesbian, gay and transgender community. (AP Photo/Noah Berger) Photo: Noah Berger, Associated Press

A contingent of "Dykes of Bikes" kicks off San Francisco's 42nd annual gay pride parade on Sunday, June 24, 2012. (AP Photo/Noah Berger) Photo: Noah Berger, Associated Press

A child holds a balloon under a Pride flag held by participants marching during Seattle's annual Gay Pride Parade on Sunday, June 24, 2012. (AP Photo/seattlepi.com, Joshua Trujillo) Photo: Joshua Trujillo, Associated Press

NEW YORK - JUNE 24: Revelers kiss in front of the Stonewall Inn during the New York City Gay Pride March on June 24, 2012 in New York City. The annual civil rights demonstration commemorates the Stonewall riots of 1969, which erupted after a police raid on a gay bar, the Stonewall Inn on Christopher Street. (Photo by Michael Nagle/Getty Images) *** BESTPIX *** Photo: Michael Nagle, Getty Images

Evelyn Kennedy marches with a hula hoop during Seattle's annual Gay Pride Parade on Sunday, June 24, 2012. (AP Photo/seattlepi.com, Joshua Trujillo) Photo: Joshua Trujillo, Associated Press

Luis Ramirez, left, and Luis Aguilar share a kiss during the Seattle Gay Pride Parade on Sunday, June 24, 2012, in Seattle. The couple walked with "Entre Hermanos," a Seattle Latino LGBT organization, and dressed in wedding-themed attire to promote marriage equality. (AP Photo/The Seattle Times, Erika Schultz) SEATTLE OUT; USA TODAY OUT; MAGS OUT; TV OUT; SALES OUT; MANDATORY CREDIT Photo: Erika Schultz, Associated Press

Participants march with a Pride flag during Seattle's annual Gay Pride Parade on Sunday, June 24, 2012. (AP Photo/seattlepi.com, Joshua Trujillo) Photo: Joshua Trujillo, Associated Press

Lenny Broberg, an inspector with the San Francisco police department, hugs boyfriend Eric Kissenger while marching in San Francisco's 42nd annual gay pride parade on Sunday, June 24, 2012. Organizers say more than 200 floats, vehicles and groups of marchers took part in the parade. (AP Photo/Noah Berger) Photo: Noah Berger, Associated Press

Michelle Halpain, a volunteer with President Barack Obama's re-election campaign, joins fellow democrats marching in San Francisco's 42nd annual gay pride parade on Sunday, June 24, 2012. Organizers say more than 200 floats, vehicles and groups of marchers will take part in the parade. (AP Photo/Noah Berger) Photo: Noah Berger, Associated Press

NEW YORK - JUNE 24: A reveler spanks a march participant during the New York City Gay Pride March on June 24, 2012 in New York City. The annual civil rights demonstration commemorates the Stonewall riots of 1969, which erupted after a police raid on a gay bar, the Stonewall Inn on Christopher Street. (Photo by Michael Nagle/Getty Images) Photo: Michael Nagle, Getty Images