Thanks to a tight presidential race and unlimited political ad spending by corporations for the first time, political advertising on local television stations will grow by more than $500 million compared to 2010  to a total of $2.8 billion — marking the largest dollar increase in history — according to a report by Moody’s Investor Service released Thursday” says the Hollywood Reporter.

Citizens United shifted spending from the candidates to outside groups. While candidates qualify for “lowest unit rate,” these outside groups do not. That’s a windfall for radio and TV…