Legislation designed to increase competition in the credit rating business and provide more protection to investors has gained some Republican backing in the House, but lawmakers remain uncertain when they’ll put together broad support to begin moving the bill toward enactment. “The Credit Rating Agency Duopoly Relief Act of 2005,” H.R. 2990, introduced by Rep. Michael Fitzpatrick, R-PA, aims to improve rating quality by fostering competition, transparency and accountability in the credit rating industry. During…