Carter later wrote that the most intense and mounting opposition to his policies came from the liberal wing of the Democratic Party, which he attributed to Ted Kennedy's ambition to replace him as president. After Kennedy announced his candidacy in November 1979, questions regarding his activities during his presidential bid were a frequent subject of Carter's press conferences held during the Democratic presidential primary. Kennedy surprised his supporters by running a weak campaign, and Carter won most of the primaries and secured renomination. However, Kennedy had mobilized the liberal wing of the Democratic Party, which gave Carter weak support in the fall election. Carter and Vice President Mondale were formally nominated at the Democratic National Convention in New York City. Carter delivered a speech notable for its tribute to the late Hubert Humphrey, whom he initially called 'Hubert Horatio Hornblower.'