DES MOINES, Iowa—Members of the Iowa Interfaith Immigration Coalition are urging presidential candidates of both parties to conduct the debate over immigration policy in a civil manner “that respects human dignity.” In a Dec. 4 news conference, Connie Ryan Terrell, executive director of The Interfaith Alliance of Iowa, led a group of speakers who gathered to “change the negative, public attitudes and rhetoric which demonize and dehumanize our immigrant friends and neighbors.” Ms. Terrell said this “destructive attitude has permeated our nation,” making the discussion about immigration a more “complex and difficult debate.” In a four-week period, more than 3,600...