Clinton’s IA ad trumpets Des Moines Register endorsement, as expected. Watch ad above. Read script here. Clinton campaign also running a companion radio ad in IA beginning Monday.

Obama’s IA spot also quotes from IA’s largest daily and other sources. Emphasizes “change” and “candor,” with a populist twist. Watch ad above. Read script here.

Plus: On the stump, Obama makes rare direct challenge to Edwards on special interest records.