Rate Colorado in 2020

[pbrower2a]

And, how far gone do you believe it is for GOP generally?

Likely D, practically a mirror image of West Virginia in its voting pattern.   Fast-growing Hispanic electorate, lots of transplanted Californians among non-Hispanics (so I don't double-count I make that distinction), well-educated white population... it all bodes ill for Republicans as long as Republicans play on contempt for learning.

Mexican-Americans respect formal education about as much as do Asian groups even if they do not have the formal education themselves. They do not want their children to grow up as a permanent underclass.

[pbrower2a]

What would it take to make CO back to a light red state again?

Another Eisenhower. Remember that Obama has much the same temperament as Eisenhower, and won only one state (North Carolina, barely and once) that Ike ever lost. Note that Eisenhower won  Massachusetts, Minnesota, and Rhode Island together -- which no Republican has done since the 1920s -- and did it twice. Ike won Virginia  for the first time as a Republican in 24 years, and Obama won Virginia for the first time in 44 years -- and did so twice.

This goes beyond coincidence. Obama did badly in ranch country, though.