Why is Colorado so hostile to her? She isn't that different from Obama, and what she loses with young voters can be made up by older voters.
Obama appealed to the Denver suburbs. He was young, new, and academic. Hillary is, as some have noted, Washingtonian.
Bill Clinton won Colorado in 1992 40-36-23 and lost it in 1996 44-46-7. Bill won the state in 1992 because of Ross Perot and lost it in 1996 because Dole picked up a much-larger percentage of Perot voters (gaining 10% to the 4% of the Perot voters of 1992 that Bill Clinton picked up).
Colorado seemed to be drifting D -- but remember that it is largely near Denver, Pueblo, and the New Mexico state line. Some Colorado counties went more than 80% to Romney in 2012, demonstrating how politically polarized Colorado is. People in those counties are getting very loud in their disdain for what they consider 'Mile-High Marxists' who do not understand them, and that is beginning to show in Colorado polling.
https://uselectionatlas.org/RESULTS/state.php?year=2012&fips=8&f=1&off=0&elect=0 Barack Obama probably maxed out the Democratic vote in 2008 in Colorado and came close in 2012. Hillary Clinton will have a tough time in Colorado if the Colorado Right energizes its base.