Colorado Democrats say they inadvertently elected some Republicans and Green Party members as delegates to county conventions.
About 3 percent of the local Democratic delegates and alternates elected on February 5th were ineligible. Some belonged to other parties but others were Democrats who went to the wrong precinct.
Party officials blame the confusion on an overwhelming turnout of about 120,000 people. They don't believe enough ineligible votes were cast to change the outcome.
Barack Obama won in Colorado with 66 percent to Hillary Rodham Clinton's 32 percent.
Party officials say 172 of the elected delegates and alternates are ineligible. They'll be challenged but will get a chance to try show they are eligible.