A nonprofit group formally alleged Wednesday that more than a dozen Colorado lawmakers violated the state’s prohibition on gift-giving when they asked a prominent dark-money organization to help pay for an October mountain retreat.

Colorado Common Cause, a government watchdog group, made public its allegations in the first of several complaints set to be filed to the state’s Independent Ethics Commission this week. The documents will focus on members of the Opportunity Caucus, a select group of Democratic lawmakers, and their ties to One Main Street, a political group that does not disclose most of its donors but has spent extensively to elect what it describes as “pragmatic” Democrats over more left-wing opponents.

The complaints allege that the legislators violated a state constitution

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