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Clinton derided Republican Mitt Romney as vague and backward in remarks to a small but enthusiastic crowd of Democrats at a high school just north of Denver. Clinton also planned to rally Democrats at a Denver school.

Clinton urged the Democrats, "Go out and deliver Colorado for President Obama."

The hurricane also prompted Republican vice presidential candidate Paul Ryan to scrap a Colorado trip planned for Tuesday. Obama and Ryan both rescheduled events for Thursday, a day before early voting ends in Colorado.