WASHINGTON — Senate Democrats on Tuesday secured the 60 votes they will need to ensure passage of the most sweeping changes to financial regulations since the Great Depression, after Nebraska Democrat Ben Nelson said he would vote for a version of the bill hammered out by a House-Senate conference late last month.

Nelson was expected to join 56 other Democrats in support of the measure, as well as Republicans Susan Collins and Olympia Snowe of Maine and Scott Brown of Massachusetts.

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