With key Obamacare tax credits set to expire within weeks, Democrats have unified behind a simple message: extend the subsidies and keep health insurance premiums from spiking for more than 20 million Americans.

Republicans, meanwhile, have engaged in a wide-ranging blame game while scrambling to coalesce behind an easily digestible plan to lower health care costs. That struggle comes to a head this week as House leaders move to put what they hope will be a consensus GOP plan up for a vote.

House Republican leaders chose a narrow set of proposals to include in that plan, arguing they lacked broad agreement for a more comprehensive undertaking…

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