WASHINGTON — Democratic Rep. Ruben Gallego is giving his party something to celebrate in an otherwise brutal 2024 election, winning an open Senate race in battleground Arizona, even as President-elect Donald Trump carried it handily.

The senator-elect did it by outperforming Vice President Kamala Harris’ margin by 8 points in the state. Latino voters overall were more than a quarter of Arizona’s electorate — Gallego won them by 22 points while Harris carried them by 10 points. As for…