Washington — The Senate is set to take a long-anticipated vote on a Democratic health care proposal this week, a key tenet of the deal to end the government shutdown. But the measure is unlikely to secure the necessary support to advance in the GOP-controlled Senate.

The Senate is expected to vote Thursday on an extension of enhanced Affordable Care Act tax credits, an issue that was at the center of Democrats' demands in the shutdown fight. The vote was part of an agreement to reopen the longest government shutdown in history, which came to an end when a group of eight Senate Democrats joined Republicans to end the impasse last month. That deal included a promise from GOP leaders to allow a vote on ACA subsidies during the second week of December.

Democrats had the opportunity to prese

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