DES MOINES, Iowa - Democratic presidential candidate Joe Biden picked up another high profile endorsement on Saturday in Iowa, where the party’s nominating contest kicks off in nine days, after U.S. congresswoman Cindy Axne said she was backing the former vice president. Axne, a freshman U.S. lawmaker and moderate, is the latest in a slew of big-name endorsements for Biden in Iowa which could have an impact on undecided voters as caucus day nears on Feb. 3. Two former Iowa Democratic governors, Tom Vilsack and Chet Culver, have backed Biden, as has another U.S. House member, congresswoman Abby Finkenauer.