A new report released by the Wesleyan Media Project in partnership with the Center for Responsive Politics hows that 2016 presidential advertising is more than twice what it was at the same point in 2012.
Advertising Volume Up 122% Over 2012 Levels; Spending in Presidential Race Over $400 million
The Center for Responsive Politics has a great OpenSecretsBlog post with highlights from the report.
Advertising surges in presidential race; dark money dominating Senate contests