Support immigration reform. That's why Trump was doing the weakest performance against Hillary Clinton among the 2016 Republicans in Colorado. And that's why George W. Bush won Colorado in 2004 because he pledged to reform the immigration system in his second term, which must have reinforced his appeal among Hispanic voters in Colorado like it did in Florida, Nevada and New Mexico.
https://en.wikipedia.org/wiki/Pre-2016_statewide_opinion_polling_for_the_2016_United_States_presidential_election#Colorado
