How Impeachment Could Warp the Polls

Mark Blumenthal: “The impeachment story is blowing up. It’s a high-stakes moment — for President Trump, for Democrats and for pollsters. It’s also a scary moment for polling.”

“Yes, people who follow politics are now intensely interested in whether the latest developments might shift public opinion about Trump and impeachment. But when news is exceptionally big, a growing body of evidence suggests it can throw off the accuracy of polling itself.”