Colorado is one of a dozen states committed to giving its electoral votes to the presidential candidate who wins the popular vote nationwide.
Gov. Jared Polis, a Democrat, signed the bill into law Friday afternoon, just over two weeks after the state Legislature approved it.
The governor had 10 days to add his signature once the bill got to his desk. Now that he has, opponents are free to begin gathering signatures from others, so that the measure is forced to go to a ballot. They have until 90 days after the legislative session ends to gather the 124,632 signatures needed for that to happen.
Colorado joins California, Connecticut, Hawaii, Illinois, Massachusetts, Maryland, New Jersey, New York, Rhode Island, Vermont, Washington, and Washington, D.C., in adopting a law like this. The National Popular Vote compact won't become active until 270 electoral votes are guaranteed. With Colorado’s nine electoral votes, the pact has 181.