Candidates are expected to spend over $3 billion this election cycle just by buying ad time. They're buying spots in Ohio, Florida and Iowa, and they're running almost non-stop.
The state with the most ads currently running is Las Vegas, Nevada.
Some 75,000 political ads have run in the Vegas market this year, and in a city that likes to pull out all the stops, that's a record.
Here to explain why so many ads, and how his fellow citizens are dealing with them, John Ralston. He's a long-time Nevada political observer and publisher of the Ralston Report.