First, remembering that this year ends in an "8", we should consider that over the past 9 decades, years ending in 8 were up 78% of the time (7 of 9).
Second, with respect specifically to Presidential Election Years, they have been UP from June to December 81% of the time since 1924 (17 of 21).  (see below)
In other words, we have several bullish indicators for the remainder of this year.
 1924 - up
 1928 - up
 1932 - up
 1936 - up
 1940 - up
 1944 - up
 1948 - down
 1952 - up
 1956 - up
 1960 - down
 1964 - up
 1968 - up
 1972 - up
 1976 - down
 1980 - up
 1984 - up
 1988 - up
 1992 - down
 1996 - up
 2000 - up
 2004 - up