In a statement Monday, Hickenlooper said that there have been disturbing reports of people going to the polls not to vote but to "disrupt the process."
Spokesman Eric Brown says there have been reports of people asking for ballots but walking away without casting them in El Paso and Pueblo counties. He said the missing ballots could be used as a reason to challenge the results of the election.
The Pueblo county clerk says three people apparently didn't cast ballots on electronic machines after being given cards to activate them Saturday. Election judges there are now inserting the cards on behalf of voters.