Tim Roemer is a gifted salesman working a tough territory. For weeks, the former Indiana congressman has been crisscrossing primary states trying to convince Roman Catholic voters that Barack Obama is their man. Just a few months ago, there were plenty of takers. Obama beat Hillary Clinton among Catholics in Louisiana and Virginia and tied her in Wisconsin. But in more recent primaries, Catholics have decisively turned away from him. In Ohio, exit polls showed that 65 percent backed Clinton. In Pennsylvania, Clinton won 70 percent of the Catholic vote.
Numbers like this—and distractions like Wright—are frustrating for Obama, who envisions himself as the only candidate who can bridge the divide between secular liberals and religious conservatives and recast the Democrats as a party that welcomes the faithful. In his speech to the Democratic National Convention in 2004, he spoke of worshiping an...