Senate Republicans and Democrats took turns sinking each other’s proposals to address the looming expiration of health insurance subsidies for many working-class citizens, seemingly ensuring a spike in costs and a drop in coverage within weeks.

Sens. Mark Kelly and Ruben Gallego, both Arizona Democrats, voted Dec. 11 with their party on a three-year extension of the subsidies, and they both voted against a Republican plan to expand health savings accounts and direct cash payments intended to mitigate the rising cost of insurance.

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