Should We Judge People By How They Speak?

There are many things for which we might possibly judge people: ethics, appearance, knowledge, athleticism, health, height, humor, etc. Some of these are more and others less important as ways of evaluating other people. How does the ability of a person to speak eloquently fit into the list of things we might use to evaluate a person? How important are grammar, phrasemaking, vocabulary, concision, comprehensibility, quickness, etc.? Given the apparent impact of eloquence on the Democratic Primaries, there is also the question of how much leadership depends upon or can be measured by it.