Supreme Court Ruling on Mail-in Ballots in Pennsylvania

With just four days left, both candidates are in Wisconsin tonight; a so-called Blue Wall state that is critical for both campaigns. CNN’s John King has the latest polling. Plus, the Supreme Court on Friday left in place a Pennsylvania court ruling that is expected to expand backup options for voters whose ballots are rejected for technical reasons, in a defeat for Republicans in the crucial battleground state. Elie Honig explains what this is all about.

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