A federal judge on Tuesday denied the Colorado Republican Party’s request for an emergency injunction barring unaffiliated voters from participating in the state’s upcoming Republican primary election. U.S. District Court Judge Philip A. Brimmer said that preventing unaffiliated voters from receiving Republican primary ballots just weeks before ballots for the June 30 primary are scheduled to go out in the mail would lead to voter confusion, violating a longstanding federal court doctrine that cautions against changing election rules “on the eve of an election.” Lawyers for the state GOP asked the court on April 20 to prevent the party’s primary ballots from going to unaffiliated voters , based on a March 31 ruling by the same judge that found a portion of the voter-approved law that establishes the state’s semi-open primary system unconstitutionally infringes on the party’s freedom of association under the First Amendment.…