[187] Biden's son Beau ruled himself out of the 2008 selection process due to his impending tour in Iraq with the Delaware Army National Guard.[188] He was a possible candidate for the 2010 special election, but in early 2010 said he would not run for the seat.[189]

^ Kyrsten Sinema, whose seat was not up for election in 2022, left the Democratic Party and became an independent politician in December 2022, after the election but before the swearing in of the next Congress. As a result, 48 Democrats (rather than 49), plus Angus King and Bernie Sanders, independents who caucus with Democrats, were in the Senate upon commencement of the 118th United States Congress, on January 3, 2023. Sinema has ruled out caucusing with Republicans, and she has said she intends to align mostly with Democrats and keep her committee assignments.[465]

^ In 1981, President Ronald Reagan referred to the Armenian genocide in passing in a statement regarding The Holocaust, but never made a formal declaration recognizing it.