Breakingviews: Trump's $4.6 billion in free media

Jennifer Saba
Republican presidential nominee Donald Trump is seen on television screens at the media room during the first presidential debate with U.S. Democratic presidential candidate Hillary Clinton at Hofstra University in Hempstead, New York, September 26, 2016.
Carlos Barria | Reuters

Republican U.S. presidential candidate Donald Trump is rewriting the script for political TV advertising. So far, he has spent only $78 million on ads. U.S. broadcasters usually count on an election-year windfall, but spending is forecast to fall and digital upstarts like Snapchat are in the mix looking for a piece of the pie.