DES MOINES, Iowa — One presidential campaign claims an impressive effort in Iowa this year: eight offices opened, 350,000 phone calls to potential supporters and 1,280 events to recruit and train volunteers.It's not Mitt Romney or Newt Gingrich or Ron Paul. It's Obama for America, the president's re-election campaign, which badly wants to win this battleground state in November, as it did in 2008.Read More... More on Video