Actually Nate Silver did criticize polls like this on his podcast. At least the choice of weighting based on who they voted for in the past election. Which is k

Actually Nate Silver did criticize polls like this on his podcast. At least the choice of weighting based on who they voted for in the past election. Which is known to be very biased. 538 does grade the quality of polls and excludes/weights polls that have lots of problems.