Trump’s campaign manager Corey Lewandowski, who has significant experience in voter registration, declined to comment on the data program. “We don’t discuss internal procedures, however Mr. Trump has been underestimated through every step of this campaign, to many people’s demise,†said Lewandowski, who ran a pilot registration project for Americans for Prosperity in 2014. But the very existence of the Trump data program undermines the assumption that his campaign is uninterested in ― or unaware of ― the basic technological infrastructure needed to identify and mobilize voters. Such tools, used so effectively by Barack Obama during his two presidential campaigns,...