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After opposing him, Giuliani endorses Romney

Top Talkers: Tuesday is GOP primary day in Pennsylvania, New York, Delaware, R.I. and Conn., and Mitt Romney is poised to pick up more delegates. And ahead of the primaries, Romney picked up the endorsement of former New York City Mayor Rudy Giuliani. The Morning Joe panel – including Time's Mark Halperin and Mike Barnicle – discusses the endorsement.