How do US elections affect the S&P 500 performance?

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S&P DEP RECEIPTS (NYSE: SPY) Delayed: 773.93 -3.29 (0.42%)
Previous Close $777.22    52 Week High $219.60 
Open $774.86    52 Week Low $181.02 
Day High $777.09    P/E N/A 
Day Low $770.44    EPS $0.00 
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