Travis Ridout was interviewed in this article on the impact of money in politics that appeared on the website fivethirtyeight.com.
“What’s more, Ridout said, ads probably matter least in the races where campaigns spend the most on them — like presidential elections. Partly, that’s because the bigger the election, the more we already know about the people running. It’s not like anyone went into the 2016 presidential race confused about who Donald Trump and Hillary Clinton were, for example.”