WASHINGTON  The Bush White House, particularly before the 2006 midterm elections, routinely violated a federal law that prohibits use of federal tax dollars to pay for political activities by creating a “political boiler room” that coordinated Republican campaign activities nationwide, a report issued Monday by an independent federal agency concludes.

The report by the Office of Special Counsel finds that the Bush administration’s Office of Political Affairs  overseen by Karl Rove  served almost as an extension of the Republican National Committee, developing a “target list” of Congressional races, organizing dozens of briefings for political appointees to press them to work for party candidates, and sending cabinet officials out to help these campaigns.

The report, based on about 100,000 pages of documents and interviews with 80 Bush administration officials in an investigation of more than three years, documented how these political activities accelerated before the 2006 midterm elections.

This included helping coordinate fund-raising by Republican candidates and pressing Bush administration political appointees to help with Republican voter-turnout pitches, particularly in the 72 hours leading up to the election when Democrats took control of the House and Senate for the first time in a dozen years.