In December 2011 Gori joined the centre-left
Democratic Party. In 2012 he became a close advisor of
Matteo Renzi, the
Mayor of Florence who was running in the primary election to become the centre-left candidate for Prime Minister in the
general election of the following year. In 2014 Gori announced his intention to run in the
Bergamo municipal election in the same year. In the centre-left primary election in February he gained 58.5% of votes beating the civic Nadia Ghisalberti and Luciano Ongaro (member of
Left Ecology Freedom). In the
mayoral election of June 2014, Gori gained 45.1% of votes in the first round and then he won with 53.5% against the centre-right incumbent Mayor Franco Tentorio. On 1 June 2017 Gori announced his intention to run as centre-left candidate to the
Presidency of Lombardy in the
Lombard regional election of 4 March 2018. Gori's principal rivals were
Attilio Fontana (LN, supported by center-right coalition) and
Dario Violi (M5S). On 4 March 2018 Gori lost the
regional election with 29%, the worst result of a center-left candidate since the
2000 election. As the mayor of Bergamo, Gori raised controversy on 11 February 2020 by tweeting that he dined in a Chinese restaurant in solidarity with citizens who were attacked by "alarmists", and adding that there was "really nothing to fear". Term-limited in 2024, Gori ran for European Parliament as number two candidate on the Democratic Party list in Northwest Italy constituency. He received 211 426 preference votes and was elected. In his hometown of Bergamo, he came first with 11 610 preference votes, 8 000 more than Prime Minister Giorgia Meloni. ==References==