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US President Barack Obama (L) and Republican presidential candidate Mitt Romney finish their debate at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate.
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.