Four potential obstacles in House vote to end US government shutdown

The spending plan may have passed the Senate, but it's not yet a done deal in the lower chamber of Congress.

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The lower chamber of Congress is expected to vote by Wednesday evening on the funding measure.

Unlike in the Senate, if House Republicans stay united, they don't need any Democrats to pass the budget. But the margin for error is razor thin.

Here are four potential hold-ups for the budget, before it can clear Congress and land on the president's desk for signing into law.

A key sticking point throughout the shutdown has been a desire on the part of Democrats to attach to the spending bill a renewal of tax credits that make health insurance less expensive for 24 million Americans.