Opponents of the law obtained enough signatures in a referendum petition to place the law on the ballot for approval or rejection by the voters.

Deadlines approached not only for submitting the referendum petition but also for firming up lease agreements and other details.

After the current effort started several years ago, opponents disqualified one referendum petition in court.

Putting the referendum petition on the Internet was a little premature, in my opinion.

An earlier Colorado law had made it a crime to pay people to collect signatures for referendum petitions.

On 19 November 2012, two women brought a referendum petition challenging the yes result.

The president will only sign the referendum bill into law if and when the referendum petition fails.

The division oversees filings for statewide initiative and referendum petitions.

While the process dragged on, public employees who signed the referendum petition were fired, demoted and denied national identity cards and passports.

Usually the percentage of signatures required for the referendum petition is less than for the initiative.