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The special election on Tuesday in Arizona’s 7th Congressional District is widely expected to narrow the GOP’s already slim majority in the U.S. House.

Democrats enjoy a nearly two-to-one voter registration advantage over Republicans in southern Arizona's left-leaning congressional district, which stretches from Yuma to Tucson and includes almost the entire length of the state's border with Mexico.

Democratic Pima County Supervisor Adelita Grijalva, the daughter of the late congressman, is facing off in the special election against small business owner and contractor Daniel Butierez, the Republican nominee, with two third-party candidates also on the ballot.

"In Congress, I commit to fight Trump’s cruel agenda, like the Big

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