Republican senators return on Monday from a 10-day recess with immediate decisions to make on their quest to overhaul the 2010 health care law.

While Senate leaders have largely avoided putting any artificial timelines on their endeavor, the GOP is under an extreme time crunch to produce and advance their own legislation to match the House bill that narrowly passed the chamber last month.

Some members, however, are now openly doubting whether Republicans can follow through on their seven-year effort to repeal and replace President Barack Obama’s signature domestic achievement.

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For years, Republicans savaged Democrats for supporting the Affordable Care Act, branding the law — with some rhetorical license — as a government takeover of health care.

Now, cast out of power in Washington and most state capitals, Democrats and activist leaders seeking political redemption have embraced an unlikely-seeming cause: an actual government takeover of health care.

At rallies and in town hall meetings, and in a collection of blue-state legislatures, liberal Democrats have pressed lawmakers, with growing impatience, to support the creation of a single-payer system, in which the state or federal government would supplant private health insurance with a program of public coverage. And in California on Thursday, the Democrat-controlled State Senate approved a preliminary plan for enacting single-payer system, the first serious attempt to do so there since then-Gov. Arnold Schwarzenegger, a Republican, vetoed legislation in 2006 and 2008.

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