Arizona special congressional house primary Grijalva.

Eight candidates will go before southern Arizona voters Tuesday in special primaries to replace longtime Democratic congressman Raúl Grijalva, who died in March from complications from cancer treatment. The winners will represent their parties in a Sept. 23 special election to serve out the remaining 15 months of Grijalva’s term. The seat will not decide control of the U.S. House but could chip away at Republicans’ slender 220-212 majority in the chamber. The seat is one of three vacancies in heavily Democratic districts.