Democrat Adelita Grijalva has won a special election in battleground Arizona, securing the congressional seat left vacant by her father’s death and further eroding Republicans’ razor-thin House majority.

The Associated Press reports that Grijalva, a former Pima County supervisor, defeated business owner and contractor Daniel Butierez, the Republican nominee, in Tuesday’s election in southern Arizona’s 7th Congressional District.

Grijalva will serve the remaining 15 months of the term of Raul Grijalva, who died in March following complications from cancer treatment.

The younger Grijalva’s victory was anything but a surprise in the left-leaning district.

Democrats enjoy a nearly two-to-one voter registration advantage over Republicans in the Hispanic-majority district, which stretches

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