Democrat Raúl Grijalva has won a seventh term representing Southern Arizona in Congress.
He defeated Republican Gabriela Saucedo Mercer for a second time.
District 3 includes parts of Pima, Maricopa, Pinal, Santa Cruz and Yuma counties. Grijalva had significant leads in all but Maricopa County Tuesday night.
"I'm very gratified," Grijalva said at a celebration at his campaign headquarters Tuesday night. "It's not a routine for me. This is a 2-year employment contract with the voters and you gotta work at it every year."
Grijalva will return to a changed landscape in which he's a member of a smaller minority party in the House and Senate.
"While it's devastating to some extent, it could really be liberating for Democrats," Grijalva said, because Republicans won't be able to blame the President for inaction.
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Grijalva said he would continue to focus on immigration, the environment and the budget.
Saucedo Mercer ran a grassroots campaign, having raised about $80,000 this election cycle. Her strategy included significant time campaigning in Maricopa County, and she won in that county.
Grijalva raised about $550,000. He didn't attack his opponent and ran a race that focused on getting out the vote, he said.
And unlike other Congressional races in Southern Arizona, this race did not attract money from outside groups.

