How far can Democrats ride the affordability argument? A progressive running in deep-red Tennessee is about to find out

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.