The Senate blocked legislation Wednesday that would have regulated the amount of time troops spent in combat, a blow for Democrats struggling to challenge President Bush's Iraq policies.

The 56-44 vote was four votes short of reaching the 60 needed to cut off debate. It was the second time in as many months that the bill, sponsored by Sen. Jim Webb, D-Va., was sidetracked. In July, a similar measure fell four votes short of advancing.

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