Ever win a bet with a friend and not been able to collect? Everyone knows a guy who owes you money but makes you feel like a jerk whenever you bring it up. Sooner or later, you just write it off and stop mentioning it. He lost the bet, but won in the long run. That’s the celebrities who promised to leave the country if Donald Trump won in 2016. The 2020 election is our chance to collect. Maybe they didn’t get the message last time, maybe they thought we were joking? We weren’t joking. Many people, me among them,...