Hart declined to run for re-election to the Senate, leaving office when his second term expired with the intent of running for president again. On December 20, 1986, Hart was allegedly followed by an anonymous private investigator from a radio station where he had given the Democratic Party's response to President Reagan's weekly radio address. That alleged investigator report claimed that Hart had been followed to a woman's house, photographed there, and left sometime the following morning. This allegation would ultimately cause him to suspend his planned presidential campaign. After Mario Cuomo announced that he would not enter the race in February 1987, Hart was the clear frontrunner for the Democratic nomination in the 1988 election.