In this paper, we provide a quantitative and qualitative analyses of the viral tweets related to the US presidential election. In our study, we focus on analyzing the most retweeted 50 tweets for everyday during September and October 2016. The resulting set is composed 3,050 viral tweets, and they were retweeted over 20.5 million times. We manually annotated the tweets as favorable of Trump, Clinton, or neither. Our quantitative study shows that tweets favoring Trump were usually retweeted more than pro-Clinton tweets, with the exception of a few days in September and two days in October, especially the day following the first presidential debate and following the release of the Access Hollywood tape. On two days in October 2016, pro-Trump tweet volume accounted for than 90\% of the total tweet volume.