Arizona has nine congressional districts. Republicans hold a five to four advantage. The 2nd district, being vacated by Republican Martha McSally - she's running for Senate - is the seat most likely to change parties in 2018.
To create your own forecast for the midterms, visit the 2018 House Interactive Map.
(a)Source: Ballotpedia (for margins). The margin is the percentage difference between the top two vote-getters in 2016.
More recent results (i.e., special elections held in 2017-18 for vacancies) are not displayed. * Race was uncontested | ^Top two vote-getters were from the same party
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