Updated 10/31, 11:55pm for typo
The partisan distribution of Colorado’s early voters has been much more equal than in other states. Democrats hold a narrow advantage (though they also have slightly more active, registered voters). There are also a substantial number of unaffiliated voters in this swing state though. The only thing we can really be sure of is that early voting turnout has blown through 2004 levels (see the graph on the right).
Note: the scales above are in thousands, of course!
Mail-in balloting remains the most popular form of early voting in Colorado—for both parties—and the Secretary of State’s office reports that of the 1.6 million mail ballots they sent out, only 1 million have so far been returned. I expect these numbers to continue to rise over the last few days.