Democrats, reeling from the Republicans' success at courting churchgoers, are focusing new attention on a religious and political anomaly: Jim Wallis, one of the few prominent left-leaning leaders among evangelical Protestants. At the start of the Congressional session, Senate Democrats invited Mr. Wallis to address their members at a private session to discuss issues. A group of about 15 House Democrats invited him to a breakfast discussion about dispelling their party's secular image. And NBC News has enlisted him to appear as a guest during its inauguration coverage opposite Dr. James C. Dobson, one of the most prominent evangelical conservatives....