Although the Republican front-runner in the 2016 presidential election has taunted his opponents as "disgusting," "dumb," and "losers," the campaign has, by at least one measure, proven to be astonishingly positive.

Almost 84 percent of the more than 66,000 ads that candidates and outside spending groups have aired to this point have been positive, according to a report from the Wesleyan Media Project, which tracks political ads at the Middletown, Connecticut-based university.

That means most spots airing between Jan. 1 and Dec. 9 "promoted a candidate as opposed to attacking a candidate or comparing one candidate against others."