Charles Dharapak

Committee chairman Rep. Bob Filner, D-Calif., questions Veterans Affairs Secretary James Peake, not pictured, at the House Committee on Veterans' Affairs hearing regarding veterans' suicides on Capitol Hill in Washington, Tuesday, May 6, 2008. Filner was elected mayor of San Diego in 2012.

San Diego has elected its first Democratic mayor in two decades, signaling yet another sign of changing demographics. Congressman Bob Filner defeated Republican City Councilman Carl Demaio by just three percentage points.

Joining us to talk about the shift in one of California's few Republican bastions is Liam Dillon, reporter for the Voice of San Diego.