Hillary Rodham Clinton's presidential campaign is already reserving airtime for ads during the Rio Olympics, the world sporting event that more than half of all Americans plan to watch, especially Republicans.

In a survey on the Olympics released through TV host NBC, Deep Root Analytics revealed the Clinton ad buy plans and noted that Republican Donald Trump has not moved to reserve time, a break from past presidential campaigns.

"Hillary Clinton has begun reserving Olympic airtime at the state level, and is reportedly currently negotiating and placing national network and cable buys during the games. This is not surprising as she is using the same media agency that Obama used in 2012, GMMB," said the report.

"Donald Trump has not yet reserved any television advertising anywhere," said Deep Root.

In the 2012 presidential elections, the Republicans spent about $16 million, the Democrats $15 million, on Olympic advertising. Some 217 million Americans watched the 2012 London Olympics, the biggest event in U.S. TV history.

It could be even bigger this year as swimmer Michael Phelps goes for more gold. He was chosen as the U.S. flag bearer on Wednesday.

Advertising on the games makes good political sense, according to an accompanying survey of Americans. It showed that 54 percent of Republicans plan to watch a great or fair amount. For Democrats it's 46 percent and for independents it is 47 percent.

Overall 13 percent plan to watch a "great deal," 32 percent a "fair amount," 33 percent "not much," and 22 percent "none at all."

What's more, those who watch the Olympics live in key battleground states including Florida, Virginia, Ohio and Colorado.

The survey even offered the campaigns a roadmap to the best events to advertising on, those watched by Democrats and Republicans.

For example, if the goal influencing Republicans, pick shooting, Greco-Roman wrestling, track and field and tennis. If the target audience is Democrats, they watch handball, badminton and equestrian.

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at pbedard@washingtonexaminer.com