Every candidate is going to make mistakes. How the candidate deals with their mistakes determines if it's a big story or a one day event. I should have prefaced these rules only apply to Republicans, as I'm still waiting for Katie or Joe to explain FDR going on TV in 1930.
You'd think a person going back to her hometown to announce her Presidential campaign might have encountered such historical details during the course of having lived there, too. Made her sound like an interloper, misattributing something that likely most native Iowans know.