"To me, Lou is a smart politician. He knows what to say, where to say it and when to say it," said Arroyo, describing Barletta as appealing to old-guard residents unsettled as the city's Latino population went from 5 percent in 2000 to 37 percent in 2010 to 52 percent in 2016. "They see in Lou a guy who will protect them from a wave of immigrants."