Merkel preaches benefits of migration at 'guest worker' party

By Paul Carrel BERLIN (Reuters) - Immigration can enrich Germany and even jog Germans to learn more about Christianity, Chancellor Angela Merkel said on Monday, shrugging aside the growing unease in her coalition over the influx of nearly a million migrants this year. Speaking a day after the far-right National Front pulled off a historic win in neighboring France, Merkel lauded the contribution to Germany's economy and society of the "Gastarbeiter" (guest workers) who came in the postwar decade