WASHINGTON - Republican presidential hopeful Sam Brownback said rival Mike Huckabee should apologize for a supporter's "prejudiced whisper campaign" against him for being Catholic.The supporter, a pastor in Windsor Heights, Iowa, sent an e-mail to Brownback supporters pointing out that Huckabee is an evangelical Protestant and Brownback is not. Huckabee, a former Arkansas governor, is an ordained Baptist minister."I know Senator Brownback converted to Roman Catholicism in 2002," Rev. Tim Rude, pastor of Walnut Creek Community Church, wrote in the e-mail. "Frankly, as a recovering Catholic myself, that is all I need to know about his discernment when compared to...