Aftyn Behn, the Democratic congressional candidate for Tennesee's seventh congressional district, attends a campaign event in Nashville on November 13. George Walker IV/AP/File

Aftyn Behn, the Democratic nominee for next week’s special election in a heavily Republican Tennessee congressional district, has made affordability concerns a centerpiece of her campaign messaging – mirroring the playbook of the party’s victorious candidates for governor in Virginia and New Jersey earlier this month.

Tuesday’s contest is poised to test just how far Democrats can ride that argument in a district that President Donald Trump carried by 22 points last November.

Republicans are hoping the district’s partisan lean, combined with Behn’s progressive profile and recently resurfaced remarks on polic

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