We're talking about credulous people who were dazzled by the way he was depicted on that show. Those aren't the kind of people who are known for having a lot of intellectual curiosity or highly developed critical thinking skills. They were naive enough to believe that what they saw on TV told them everything they needed to know and didn't feel the need to look any farther.
I think that show really set him up for political success. It made a star out of him, created an image for him that a lot of people were impressed by, and equipped him with a readymade fanbase that was happy to believe whayever he said. When he announced his run and started holding rallies, his fans flocked to them, already primed to see him as a snart, savvy businessman who would know exactly how to run the country. (Never mind that running a country is absolutely nothing like running a business! 
) The rest, as they say is history.
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