Two-term governor of Washington State, [[ https://fivethirtyeight.com/features/how-jay-inslee-could-win-the-2020-democratic-nomination/ | running largely as a single-issue climate change candidate ]]. Good! Not really any advantage over Sanders, then (particularly because fighting climate change without any radical changes to America's relationship with capital is likely a fool's errand), but it's a pretty damn important issue and having a candidate beating that and only that drum will probably be a good thing.
https://twitter.com/AlexCKaufman/status/1129481793311334402