WASHINGTON -- Senate Republicans derailed a Democratic "Buffett rule" bill yesterday that would force the nation's top earners to pay at least 30 percent of their income in taxes, using the day before Americans' taxes are due to defy President Barack Obama on one of his signature election-year issues.

By a near party-line 51-45 tally, senators voted to keep the bill alive but fell nine votes short of the 60 needed to continue debating the measure. The outcome was no surprise to anyone in a vote that was designed more to win over voters and embarrass senators in close races than to push legislation into law.

At the White House, Obama denounced the vote, saying Republicans chose "once again to protect tax breaks for the wealthiest few Americans at the expense of the middle class." In a statement issued after the vote, he said he would keep pressing Congress to help the middle class.

Republicans called the measure a divisive Democratic distraction from the nation's real problems that would not address the economy's real woes.

"This legislation will do nothing with regard to job creation, with regard to gas prices, with regard to economic recovery," said Sen. Jon Kyl of Arizona, the No. 2 Senate GOP leader.

Sen. Susan Collins of Maine was the only Republican to join Democrats in voting to keep the measure alive, arguing that it was a way to begin considering a badly needed, broad revamping of the entire tax code.

The lone defecting Democrat was Sen. Mark Pryor of Arkansas, who said making the rich pay a fair share of taxes should occur as part of an overall tax overhaul, "not as a political ploy meant to score points." Neither Collins nor Pryor face re-election until 2014.

Yesterday's vote was the first time a "Buffett rule" proposal has come to a Senate vote this election year, though Democrats have tried unsuccessfully in recent months to impose modest surcharges on the income of the wealthy.

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