The information comes from Resonate, a marketing intelligence firm working with brands and political clients. The company was founded in 2008, is based in D.C., and some of its past clients include presidential and senate campaigns.
"This data is good for quick activation, being able to use it quickly in digital," said Lewis Muller, Resonate's director of client strategy. "When you combine this data and layer it on other attributes, it's really impactful."
We've seen candidates specifically try to appear associated with certain brands. Just look at Clinton's famous incognito appearance at an Ohio Chipotle in April 2015.
"It was a shrewd masterstroke of image control," wrote Josh King in his new book "Off Script," about the optics of presidential campaigns. "Compare that to Donald Trump's tweet about a taco bowl from Trump Tower," King told CNBC.
"When Hillary wants to show she's a listener, she shows up at coffee shops in liberal bastions," King said. It can be a shrewd political move to eat at a regular place like Chipotle, but sometimes you'll see a politician stop at local favorites like President Barack Obama's unscheduled visit to Smitty's Burger in Elyria, Ohio. That's guaranteed local news coverage, which can go a lot farther in swing states.
King, who worked as a visual guru in President Bill Clinton's White House and presidential campaigns, describes the leading candidates as "running around so fast, they barely have time to think" about such presumably minor details — even though everybody else will make news out of it.
He points to 1992 and 2008, when the specific watches worn by candidates Bill Clinton (a Timex Ironman) and Obama (an old TAG Heuer 1500) got a lot of attention, spiking sales for each brand.
Once they get into office, King said, presidents can be more active about "using code" to tell the public who they are, for example by which entertainers they invite to the White House, or who gets awarded at the Kennedy Center honors.