Now that I can talk about this safely without anyone taking advantage of this in Zeitgeist, thought I'd take a look at the three races that @Bruce highlighted.
The NYC mayoral election and the NJ gubernatorial race should be landslides for the Democratic candidates. While a Quinnipiac poll found de Blasio's approval rating to be just 50% back in July, New York is still a solidly liberal city and he should cruise to re-election. Polls show him leading Malliotakis by around 30-45 points.
Meanwhile, in New Jersey, since has served as Lieutenant Governor under Christie, Guadagno is being dragged down by his 14% approval rating. RCP has Murphy winning by 14.4%.
The real race to watch is in Virginia. I think some parallels can be draw to 2016 here. Northam was the establishment favorite and fended off a strong progressive challenge in the primary, while Gillespie nearly lost to a Trumpist candidate in Corey Stewart. According to RCP, Northam started with an 8.4% lead after the primary, but he has failed to create excitement and has made some missteps along the way, especially in recent weeks, after a controversial ad portraying a Gillespie voter as a Confederate sympathizer running down minority children, and a flip flop on sanctuary cities that may depress immigrant turnout and anger the progressive base. Gillespie, for his part, has tried to win back Stewart supporters, by using coded language and dog whistling, such as in an ad designed to raise fears about the MS-13 gang/attack Northam and McAuliffe for being soft on them and allowing undocumented immigrants in, or attacking McAuliffe over his policy of giving released felons the right to vote again, as well as pledging to protect Confederate statues on Virginia.
So this will be a very interesting race and may very well be a barometer of how popular Trumpism is in America. One can hardly call Gillespie anti-establishment; he was even chairman of the RNC from 2003 and 2005. But if he wins, mainstream Republicans may very well decide that co-opting parts of Trump's platform will work for them. And if Northam loses, Democrats may have a lot of soul-searching to do before the midterm elections to prevent another embarrassing defeat like this. Going into Election Day, RCP has Northam up by 3.3, but Gillespie could very well pull off the upset here.