It's been at least a decade since Democrats faced such a crowded primary field, and the Republican race is likely to heat up too. Meet some of the front-runners.
In the race are two congressman, a former state treasurer, a former state senator and a businessman, among others.
Democratic lawmakers are suing President Donald Trump over foreign money flowing into his global business empire.
The assailant, prepared with "a lot of ammo," fought a gun battle with police before he, too, was shot and later died.
The Democratic congressman from Boulder says he wants to work on renewable energy and improving education at the state level.
In modern times, private bills are mostly used to help undocumented immigrants receive temporary stays while federal officials review their cases.
The decision by House Republicans not to bring their Obamacare overhaul bill up for a vote today is got mixed reaction from Colorado’s delegation.
Members are under pressure from liberal groups to schedule constituent events, but only a few have put any on their calendars.
Read the full statements on Trump's executive order on immigration from Colorado's congressional delegation.
The agency cites "numerous comments" requesting that public opinion be considered in their deliberation.