Washington (CNN) -- In a congressional version of hot potato, the Senate on Friday passed a short-term spending plan that would prevent a looming government shutdown and sent it to the House for a weekend showdown between Republican tea party conservatives and their more moderate party leaders. The 54-44 vote on strict party lines came after Senate Democrats pushed through an amendment to restore funding for Obamacare that House Republicans had eliminated in their version of the spending measure, which would prevent the start of a government shutdown on Tuesday. Now House Speaker John Boehner must decide whether to urge his divided Republican caucus to vote with Democrats to pass the Senate plan, or yield again to a hardline conservative wing that demands making continued government funding contingent on undermining Obamacare.