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With the death of Supreme Court Justice Antonin Scalia, votes he had cast on cases already heard, but not yet publicly handed down, are now void, says Constitutional law expert and Supreme Court historian Ian Millhiser. He joins us to explain the impacts that Scalia's death may have on the big cases still before the court -- on everything from immigration to women's rights to union rights to Congressional redistricting, affirmative action, the environment and more -- and how everything we thought we knew about those cases prior to the weekend may now be turned upside down. We also discuss the GOP's unprecedented threat to block any SCOTUS appointment by Obama for the next year...and whether the GOP Senate will even allow the next President, if a Democrat, to fill the vacancy left by Scalia -- and potentially as many as three other vacancies that could occur during the next President's term...