As Jeb Bush attempted to reintroduce himself to presidential primary voters in New Hampshire this week, the former Florida governor had a problem: Many had already met him. "There's a whole negative air about Jeb amongst the people I know," said Myrna Greene, a retired school secretary who chairs the New Boston Republican Committee. Bush launched a "Jeb Can Fix It" tour intended to reboot his faltering presidential campaign in the crucial primary state after several missteps, notably a subpar debate performance. Bush has been to New Hampshire 17 times over the last two years, for a total of 30...