The midterm polls are predicting a blue wave. Can they be trusted?

Anyone who's followed American politics over the past decade or so has learned to look at political polls with a healthy dose of skepticism. Some of the most important recent elections have featured substantial polling errors that left many Americans baffled when things turned out differently than they expected. As we head into a pivotal midterm election, the polls are generally telling the same story. Forecasts point to the possibility of a blue wave that will sweep across the country, likely a