Washington ? Senate Democrats on Friday pushed to passage a budget they said would boost spending for domestic programs, renew some of the tax cuts from President Bush’s first term and still balance the books in five years.

The 52-47 vote represented a victory for Democratic leaders, who viewed passing the $2.9 trillion budget plan as a key test of their ability to govern.

But the narrow margin of Democratic control of the Senate was on ample display through four days of debate, particularly when party moderates favoring extending middle-class tax cuts forced a rewrite.

Moderates insisted on extending the most popular of Bush’s tax cuts, including the $1,000 child credit and marriage penalty relief. On the spending side of the ledger, there are big increases for defense, education, veterans medical treatment and other programs popular with both Democrats and Republicans.

The Democratic blueprint is nonbinding but sets guidelines for follow-up legislation.

The most immediate outcome would be to put Democrats in Congress on a collision course with Bush later this year when lawmakers write budget bills for Cabinet agencies. Action to renew some or all of the Bush tax cuts isn’t likely until after next year’s presidential election.

The companion Democratic plans provide for Bush’s full, $145 billion request for next year’s war costs and his $50 billion-plus increase for the core Pentagon budget. But they greatly exceed Bush’s budget hike of less than 1 percent for domestic agencies.

Nonmilitary spending would increase by $18 billion under the Senate plan, a 4 percent increase that’s much larger than passed in recent years by GOP-controlled Congresses – and likely to prompt vetoes from Bush.

The vote was mostly along party lines, with Republican Sens. Olympia Snowe and Susan Collins of Maine joining the Democrats.

Snowe and Collins deliberated in the well of the Senate – as a duo and also with GOP Whip Trent Lott of Mississippi – for more than 10 minutes before casting the last votes.

The budget plan would require lawmakers seeking to cut taxes or boost benefit programs – such as Medicare, children’s health care or farm subsidies – to “pay for” the changes with tax increases or offsetting spending cuts.

That would make it more difficult to expand the popular State Children’s Health Insurance Program that’s up for renewal this year or to ease the alternative minimum tax so that it doesn’t strike 20 million more middle-class taxpayers. Many Congress-watchers believe lawmakers will simply ignore the so-called pay-as-you-go rule.

The budget suffers, however, from some of the same flaws Democrats see in Bush’s budget plan. Like Bush, the Democrats left out funding for the long-term costs of the war in Iraq and for fixing the alternative minimum tax.

“I don’t assert that this is a perfect budget,” said Budget Committee Chairman Kent Conrad, D-N.D. “But at the end of the day, the test for us is, ‘Can we write a budget for our country?”‘