What's in the Polling Water in the Midwest?

When Abdul El-Sayed won the Democratic nomination for Michigan Senate in a nail-biter, there was some talk about this actually being a disappointing outcome for the insurgent left given late polling that suggested El-Sayed running away with the race. This struck me as basically centrist cope -- one doesn't get to claim a moral victory of losing more narrowly than expected when you outspent your…