WASHINGTON — All 41 Senate Republicans and one Democrat voted Monday evening against limiting debate on a massive financial regulatory reform bill, depriving the Democratic leadership of the 60 votes they needed to move forward with a vote by the full Senate.

The cloture vote failed 57 to 41, with Sen. Ben Nelson of Nebraska the only Democrat to vote with the Republicans. The vote came after a provision sought by Warren Buffett of Berkshire Hathaway, which would have ensured new capital requirements would not apply to existing derivatives contracts, was dropped from the bill. Berkshire Hathaway is headquartered in Omaha, Neb.

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