[2] As the Liberal Party's nominee in Saint John—Rothesay, Long drew media attention for his outspoken support of the Energy East oil pipeline project.

[3][4] In September 2017, Long made headlines for announcing his opposition to tax changes for private corporations proposed by Liberal Finance Minister Bill Morneau.

[6] In February 2021, alongside Nathaniel Erskine-Smith, Long was one of only two Liberal MPs to vote in favour of an NDP-proposed motion to take a first step towards developing a national pharmacare system.

[7] The following year, the Liberal Party would commit to work towards a "universal national pharmacare program" as part of their confidence and supply agreement with the NDP following the 2021 federal election.

[8] On December 13, 2023, a video emerged showing Long arguing with protesters calling for a ceasefire in the Israel–Hamas war during a scheduled holiday celebration for the Liberal Party.