CBS Pollster YouGov has found the two candidates tied in Colorado, Hillary at 40 and Trump at 39. The poll surveyed 991 "likely voters" and has a margin of error of 4.4%.

I have criticized YouGov in the past (see below) for not using a rigorous enough likely voter screen. It seems that the same problem evident in other YouGov state polls are present here.

Despite the seemingly inadequate likely voter screen, Donald Trump nevertheless draws to a tie in the state.

See:

CBS pollster using deceptive tactic to pad Clinton numbers

More CBS/YouGov "likely" voter polls that are really registered voter polls

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