AURORA, Colo. — In the fast-changing political battleground that is suburban Denver, Somali families dine on goat soup and fish fritters in a onetime Chinese restaurant where golden dragons still guard the doorways.

Where the English Teacup cafe once stood, a new Japanese dessert bar now stays open late, selling green tea soft-serve and fish-shaped pastries to lines of Korean and Latino teenagers.

And up and down Havana Street, auto lots once run by the likes of Dealin’ Doug are now Ethio-Motors, Maaliki Motors and Jordan Motors — names that reflect the new owners and new customers who are part of a hyperspeed transformation of this old stretch of suburbia. It has become a mile-high United Nations, where 160 languages can be heard in public-school hallways and nearly one in five people is foreign-born.

If demographics really were destiny, this place would be a gold mine for the Democratic Party’s efforts to reap political gains from an increasingly diverse and nonwhite America.

Instead, Colorado’s Sixth Congressional District has become a scene of frustration and failure for Democrats. In election after cash-soaked election, Democrats have been unable to unseat Mike Coffman, a five-term Republican congressman, even after his Republican-layup district was redrawn to slice out some conservative white voters and include thousands more Hispanic residents.

Mr. Coffman has kept winning in part because he has sought to show he embraced the needs of his newer constituents. He has positioned himself as a renegade Republican on immigration issues, scalding the president’s policies and breaking with his party’s leadership on the need for an immigration overhaul.

He has forged bonds with his district’s immigrant communities, learning to speak Spanish and spending weekends floating between meetings at Ethiopian and Korean churches, Buddhist temples and Islamic centers. He supported a path to citizenship for undocumented immigrants who were brought to the

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