WASHINGTON - The US Senate on Saturday narrowly passed its first federal budget in four years, a move that will usher in a relative lull in Washington's fiscal wars until an anticipated summer showdown over raising the debt ceiling.

The budget plan passed 50-49 at about 5 a.m. after a marathon voting session in the Democratic-controlled chamber. Four Democratic senators facing tough re-election campaigns in 2014 joined all the Senate Republicans in opposing the measure, which seeks to raise nearly $1 trillion in new tax revenues by closing some tax breaks for the wealthy.

The Senate budget, which reflects Democratic priorities of boosting near-term job growth and preserving social safety net programs, will square off in coming months against a Republican-focused budget passed by the Republican-dominated House of Representatives.

Neither of the non-binding blueprints has a chance of passage in the opposing chamber, leaving Congress no closer to resolving deep differences over how to shrink US deficits and grow the economy. But they give each party a platform from which to tout their respective fiscal visions.

The Democrats' plan from Senate Budget Committee Chairman Patty Murray aims to reduce deficits by $1.85 trillion over 10 years through an equal mix of tax increases and spending cuts.

The Republican plan from House Budget Committee Chairman Paul Ryan seeks $4.6 trillion in savings over the same period without raising new taxes. It aims to reach a small surplus by 2023 through deep cuts to healthcare and social programs that aid the elderly and poor.

Murray said after the vote that she would try to work with Ryan on a path toward compromise.

"While it is clear that the policies, values, and priorities of the Senate budget are very different than those articulated in the House budget, I know the American people are expecting us to work together to end the gridlock and find common ground, and I plan to continue doing exactly that."

Shutdown threat

The White House welcomed the Senate move. "Today, the Senate passed a budget plan that will create jobs and cut the deficit in a balanced way," White House spokesman Jay Carney said.

"Now it is time for our leaders to come together to find common ground. The president has put a plan on the table that reflects compromise, and he will continue to work with both sides to see if there is an opportunity to reach a solution to our budget challenges," he said in a statement.  

Passage of a stop-gap government funding measure on Thursday lowered the temperature in the budget debate by eliminating the threat of a government shutdown next week.

"We're going to get a breather here. Congress will let things cool off a bit and there'll be other issues that come to the forefront in the spring," said Greg Valliere, chief political strategist at Potomac Research Group, a firm that advises institutional investors on Washington politics.

These issues include legislation on gun control, immigration reform and initial work on simplifying the tax code, which is particularly important to Republicans.

Joining Republicans in opposing the Democratic budget were Democratic senators from conservative-leaning states: Max Baucus of Montana, Mark Begich of Alaska, Kay Hagan of North Carolina and Mark Pryor of Arkansas. Voting for a budget that raises tax revenues could increase their vulnerability in congressional elections next year and put Democrats' thin majority at risk.