It seems everyone and their pet Goldfish has been brainwashed into the belief that because it's an election year, we have to buy stocks. There is plenty of noise in that empirical study with some large outliers. However, Credit Suisse's Harley Bassman notes there is another cycle in election years - that of implied volatility - and he adds "the clearly defined economic nature of this election should increase implied volatility on most financial assets." As the chart below shows, volatilities tend to trough in August and peak in October into a November election - only to fall once again from two-weeks before to one week after the election. The pattern is clear.
Via Credit Suisse - with our annotations to highlight the trend
Source: Credit Suisse