Had she stayed a Democrat, Sinema would have faced a primary from Democratic Rep. Ruben Gallego, with whom she's feuded for years.

Source: https://gazette.com/news/us-world/senate-democrats-face-brutal-map/article_fb64a025-dee6-568d-9ee8-67a6fe3e5ae2.html

He also feuded with Browns coach Paul Brown and later with the team’s management, although he played his entire career with Cleveland.

Source: https://chicago.suntimes.com/2023/5/19/23730376/jim-brown-all-time-nfl-great-running-back-and-social-activist-dead-at-87

The topic of their discussion makes it seem like an even more pointed reference to has sometimes feuded with over the years.

Source: https://www.justjared.com/2023/04/07/drake-drops-search-rescue-song-read-lyrics-including-the-kim-kardashian-sample/

While Trump refused to explicitly name the Republican candidates he would not support, he has feuded with the majority of his Republican primary rivals.

Source: https://www.mediaite.com/politics/trump-says-he-wont-sign-gop-pledge-because-theres-three-or-four-people-that-i-wouldnt-support-if-they-won-the-nomination/