BATON ROUGE, La. -- President-elect Barack Obama and Gov. Bobby Jindal entered opposing sides of a bitter Louisiana congressional race, appearing in advertisements in support of their parties' contenders while the candidates readied for their only debate on Tuesday night. The president-elect lent his voice to a radio ad praising a fellow Democrat, saying "To change America, and to get Louisiana's economy back on track, I need leaders like Paul Carmouche working with me in Washington." The governor appeared in a television ad in support of fellow Republican John Fleming. The ads first aired on Monday, the day before Jindal...