Dan Clodfelter, Charlotte (D)(01 of19)
Open Image ModalCharlotte mayor Dan Clodfelter speaks during an event on Sept. 24, 2014 at the Siemens Charlotte Energy Hub in Charlotte, N.C. (Jason E. Miczek / AP Images for Siemens) (credit:AP Images for Siemens)
Kevin Faulconer, San Diego (R)(02 of19)
Open Image ModalSan Diego Mayor Kevin Faulconer speaks before the California Republican Party 2014 Spring Convention Friday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot) (credit:ASSOCIATED PRESS)
Rahm Emanuel, Chicago (D)(03 of19)
Open Image ModalChicago Mayor Rahm Emanuel speaks to members of the Safe Passage program during a training session at Chicago State University in Chicago, Wednesday, Aug. 21, 2013. (AP Photo/Scott Eisen) (credit:AP)
Ed Lee, San Francisco (D)(04 of19)
Open Image ModalSan Francisco Mayor Ed Lee speaks to reporters during a news conference after Asiana Flight 214 crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Darryl Bush) (credit:AP)
Eric Garcetti, Los Angeles (D)(05 of19)
Open Image ModalLos Angeles Mayor Eric Garcetti speaks in front of city hall after being sworn in on Sunday, June 30, 2013. (AP Photo/Mark J. Terrill) (credit:AP)
Bill de Blasio, New York (D)(06 of19)
Open Image ModalNew York City Mayor Bill de Blasio sits on stage during the swearing in ceremony for New York City's 42nd police commissioner William Bratton at One Police Plaza on January 2, 2014. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
Annise Parker, Houston (D)(07 of19)
Open Image ModalPresident Barack Obama, right, meets with Houston Mayor Annise Parker during his arrival at Ellington Airport, Friday, March, 9, 2012, in Houston. (AP Photo/Pablo Martinez Monsivais) (credit:AP)
Greg Ballard, Indianapolis (R)(08 of19)
Open Image ModalIndianapolis Mayor Greg Ballard talks the plans for the city to bid for the NFL football's 2018 Super Bowl as Allison Melangton, left, chair the 2018 Super Bowl Bid Committee, watches during an announcement in front of the downtown skyline in Indianapolis, Friday, Aug. 30, 2013. (AP Photo/Michael Conroy) (credit:AP)
Mike Duggan, Detroit (D)(09 of19)
Open Image ModalMike Duggan celebrates his election as the new mayor of Detroit at a victory party at the Renaissance Center November 5, 2013 in Detroit, Michigan. (Photo by Bill Pugliano/Getty Images) (credit:Getty Images)
Michael Nutter, Philadelphia (D)(10 of19)
Open Image ModalPhiladelphia Mayor Michael Nutter speaks about ways to reduce U.S. murder and gun violence rates and other issues affecting urban communities at the National Press Club in Washington, D.C., September 26, 2013. (SAUL LOEB/AFP/Getty Images) (credit:Getty Images)
Oscar Leeser, El Paso(11 of19)
Open Image ModalOscar Leeser poses during the reception for Hyundai Hope on Wheels and CHOC Children's Foundation's Change the World Campaign on May 10, 2011 in Orange, California. (Photo by Ryan Miller/Getty Images) (credit:Ryan Miller via Getty Images)
Greg Stanton, Phoenix (D)(12 of19)
Open Image ModalPhoenix Mayor Greg Stanton speaks at a press conference to introduce Brittney Griner (not pictured) of the Phoenix Mercury at U.S. Airways Center on April 20, 2013 in Phoenix, Arizona. (Photo by Christian Petersen/Getty Images) (credit:Getty Images)
Mike Rawlings, Dallas (D)(13 of19)
Open Image ModalU.S. Health and Human Services Secretary Kathleen Sebelius, right, with Dallas Mayor Mike Rawlings, left, discusses the implementation of the federal health care overhaul in Dallas, Texas, on Thursday, September 26, 2013. (AP Photo/Nomaan Merchant) (credit:AP)
Chuck Reed, San Jose (D)(14 of19)
Open Image ModalThis April 22, 2011 file photo shows San Jose Mayor Chuck Reed speaking during the 8th Annual CEO Summit at IBM offices in San Jose, Calif. (AP Photo/Paul Sakuma, File) (credit:AP)
Lee Leffingwell, Austin (D)(15 of19)
Open Image ModalSecretary of Health and Human Services Kathleen Sebelius, left, leads a meeting with Austin, Texas, Mayor Lee Leffingwell, second from left, and City Manager Marc Ott, right, and others at City Hall in Austin, Texas, on Thursday, Aug. 8, 2013. (AP Photo/Austin American-Statesman, Jay Janner) (credit:AP)
Alvin Brown, Jacksonville (D)(16 of19)
Open Image ModalJacksonville mayor Alvin Brown speaks to the media during the Road to Daytona Fueled By Sunoco Tour stop at City Hall on February 12, 2013 in Jacksonville, Florida. (Photo by Sam Greenwood/Getty Images for NASCAR) (credit:Getty Images)
Michael Coleman, Columbus (D)(17 of19)
Open Image ModalMayor Michael Coleman of Columbus, Ohio speaks to members of the media outside the West Wing during a news briefing after a meeting with President Barack Obama at the White House December 12, 2012 in Washington, D.C. (Photo by Alex Wong/Getty Images) (credit:Getty Images)
Betsy Price, Fort Worth (R)(18 of19)
Open Image ModalFort Worth Mayor Betsy Price looks on during a press conference before the start of the 2013 Mayor's Cup on July 26, 2013 at Texas Motor Speedway in Fort Worth, Texas. (Photo by Cooper Neill/Getty Images for Texas Motor Speedway) (credit:Getty Images)
A.C. Wharton, Memphis (D)(19 of19)
Open Image ModalMemphis Mayor AC Wharton encourages Memphians to sign up for the Affordable Care Act during a rally at the Central Library in Memphis, Tenn. Monday, Sept. 30, 2013. (AP Photo/The Commercial Appeal, Jim Weber) (credit:AP)