Is the 2016 election more similar to 1948 or 1976?

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2016 is 2016. No other election can compare to whatever he he'll we just witnessed.

There are parallels with 1992 and 1912 with Perot and Teddy Roosevelt, i.e. in the scenarios that either of them had won.

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although 1988 if Dukakis bothered to defend himself and/or  Jesse Jackson were the nominee would be a close second.

Remember, Dukakis was originally leading. That's what 2008 was looking like with Obama until the economic collapse, which made the year a freebie.