From The Politico:
The House on Thursday night turned back another call to investigate the PMA Group, a once-powerful lobbying firm whose offices were recently raided by the FBI and which has close ties to Pennsylvania Rep. John P. Murtha (D).
Twenty-one Democrats, including nine freshmen, voted to proceed with debate on the measure offered by Arizona Rep. Jeff Flake (R) calling for an investigation of the lobbying firm. Most of the Democrats represent fiscally conservative districts.
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My Comment: I call this protecting your own. Congress has no interest in embarrassing Murtha.