Wall Street Journal: “A Trump victory over Democratic rival Hillary Clinton likely would require a sweep of a set of battleground states where he is competitive but trailing in recent opinion polls—Ohio, Florida, Pennsylvania and North Carolina—and both campaigns describe them as the heart of the race. Mrs. Clinton, by contrast, could win with just one of them, partly because Democrats start with a larger number of states that historically side with them.”
“Both campaigns have put their money and their time in those states, despite suggestions they might turn elsewhere. Mr. Trump has traveled to those states more than others and has paid advertising in only these four states. Of the 20 media markets that have received the greatest number of ad spots placed by either the Clinton campaign or its main super PAC, 16 are in one of them, according to data from an ad tracker not affiliated with either campaign.”