Throughout America, there are a number of different English dialects and accents. Some well-known examples of region-specific dialects include the Boston, New York, New Orleans, and Texas accents.
These dialects, though very unique and distinct, are often hard for others to understand. Even fellow English-speakers may have trouble figuring out what someone from New Jersey means when they ask for a "tail" (hint: they probably just got out of the shower).
This is why many radio hosts, commentators, actors, and other media personalities develop a "professional voice" that is different from their real, natural accent. The aim is to speak the clearest form of English possible.
However, it seems people in the Columbus, Ohio area do that naturally.
By many accounts, the Midland English dialect, spoken by individuals in and around Columbus, Ohio, among other areas, is the clearest form of American English. According to Shippensburg University professor Dr. C. George Boeree, it is the version of American English most easily understood by fellow English speakers.
The Midland American English dialect was first recognized by Hans Kurath in 'A World Geography of the Eastern United States'.