In 1952, when Gen. Dwight D. Eisenhower (Republican) ran for president, his opponent was Adlai Stevenson (Democrat). My friends and I being young (25 to 30), we thought Stevenson was the most intelligent, articulate and convincing candidate, same as Obama. We voted for Stevenson. However, Eisenhower won 442 delegates to 89. Evidently more-mature voters sensed a smokescreen.
Turns out the former general did a great job. President Eisenhower won a second term by an even greater margin. The moral of the story is this: Just because the candidate is the better salesman doesn't mean he has the best product.