==2018 U.S. House election in Arizona's 2nd congressional district==
[[File:Martha McSally official portrait cropped 115th congress.jpg|thumb|right|160px150px|Rep. McSally retired in 2018 to run for Senate.]]
===Background===
Following speculation during December 2017 that [[Republican]] then-representative [[Martha McSally]] won't seek re-election in Arizona's second congressional district and will instead run for U.S. Senate, Márquez Peterson announced her run for the seat.<ref>[https://tucson.com/news/local/tucson-republican-jumps-into-race-for-martha-mcsallys-seat/article_d61779a8-dbbc-11e7-a366-93c0eccf43cc.html Tucson Republican jumps into race for Martha McSally's seat]</ref>