(a) AAII Sentiment Survey for the week ending 10/19/16 shows 23.74% bulls: http://www.aaii.com/SentimentSurvey. According to Charlie Bilello of Pension Partners, that reading ranks in the 7th percentile.
(b) Global fund managers' cash levels (according to Bank of America Merrill Lynch) currently average around 5.8%. According to blogger Urban Carmel, this level equals the post-Brexit high, is higher than levels seen during the 2008-09 crash, and is at its highest level since November 2011 (shortly after the 9/11/01 terrorist attacks).
(c) Everyone's worried about the election, and apparently sidelined 'til it's over.
(d) Emerging markets have outperformed since the January lows, and fund managers have increased exposure to the sector. The correct contrarian response in a typical year might be to sell at this point. However, I don't believe it's a typical year.
In my opinion, all of the above paints an extremely bullish picture.