Description:Democratic mayoral candidate Bill Thompson has conceded and endorsed Bill de Blasio for mayor of New York City.
He made the announcement on the steps of City Hall at an event that showed a united Democratic front, with de Blasio present as well as Gov. Andrew Cuomo.
Thompson had been hoping to stay in the mayoral race since last Tuesday, when front-runner de Blasio took in slightly more than 40 percent of the vote.(2:31)