The government awarded 70 percent of its contracts for Hurricane Katrina work without full competition, wasting hundreds of millions of taxpayer dollars in the process, says a House study released Thursday by Democrats. The report, a comprehensive overview of government audits on Katrina contracting, found that out of $10.6 billion in contracts awarded after the storm last year, more than $7.4 billion were handed out with limited or no competitive bidding. In addition, 19 contracts worth $8.75 billion were found to have wasted taxpayer money at least in part, costing taxpayers hundreds of millions of dollars, according to the report....