Matthew Gilbert’s notes on Thursday’s TV offerings, including the Vice Presidential Debate on multiple networks at 9 p.m.; “Last Resort” at 8 p.m. on Channel 5; “Dexter” at 9 p.m. on Showtime; “The Real Housewives of Miami” at 9 p.m. on Bravo; and “Vampire Diaries” at 8 p.m. on Channel 56.
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