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Labor Unions Financing Republican Rift With Tea Party

A Republican group promoting pro-business candidates as it battles the Tea Party in U.S. primary campaigns is being financed mostly by labor unions, one of the Democratic Party’s staunchest allies.

Defending Main Street, a super-political action committee aligned with the Washington-based Republican Main Street Partnership, received more than 90 percent of its $845,000 in donations last year from labor groups, according to reports filed with the Federal Election Commission.