On June 10, 2013, Daley announced via YouTube that he would launch an exploratory committee to run for Governor of Illinois. On July 2, 2013, New York Mayor Michael Bloomberg endorsed Daley for governor. On July 30, 2013, Daley filed documents declaring himself an official candidate to challenge incumbent Governor Pat Quinn in the 2014 Democratic primary. On September 16, 2013, Daley made a surprise announcement that he was exiting the race due to the personal hardships inherent in running a campaign for elected office.