Here is how the market movement during the presidential election years in the past few decades:

2004:  1060 (8/13/2004) -> 1131 (9/21) -> 1101 (9/28) -> 1142 (10/6) -> 1093 (10/25)
2000:  All the way down
1996:  up staring July
1992:  up starting 10/02

1988:  256.5 (8/23) -> 284(10/24) -> 263 (11/16) - up some
1984:  up first week of august, then consolidation to the end of year
1980:  perfect uptrend from 3/27 -> end of November
1976:  high on 9/22 drop to 11/10 and up to year end

1972:  up from 10/17 - 12/12

Let's see how the market play for this election season...