(CNN) - The U.S. Chamber of Commerce, a major conservative, pro-business group, is showing its support for Sen. Dick Lugar with hundreds of thousands of direct mail pieces, just days before the longtime senator faces his biggest primary challenge in 35 years.

In the flier, the group praises Lugar for supporting the Keystone pipeline, a proposal that Republicans argue would create thousands of private sector jobs but has faced heavy pushback from Democrats and the president over environmental concerns.
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