Larry Hogan didn't lead single poll in 2014 except the very last one and still won an upset. Not saying this is likely to happen this time, but single-digit leads are no reason to stop polling because "it's over". Trendlines matter equally, especially in the final weeks and days.
Yeah, maybe I went a little too far, but I take issue with your Hogan comparison since there weren’t nearly as many polls of MD-GOV 2014 in the run-up to the election as in this state, the Hogan race didn’t receive disproportionate media attention, turnout was far lower, etc. There would have to be a pretty substantial polling error for O'Rourke to win, which I certainly wouldn’t rule out by any means, but I also wouldn’t want to rely on it. I definitely don’t get why people are so convinced that he’s more likely to win than Bredesen or Heitkamp. Sure, TX could very well end up being closer than ND/TN, but quite frankly I don’t think O'Rourke is the right candidate to win a federal race in a state which is still very tough terrain for Democrats.