DES MOINES, Iowa (AP) – New financial disclosures show the candidates in western Iowa’s 4th Congressional District are succeeding in raising lots of campaign cash. Incumbent Republican Rep. Steve King reports raising $450,000 in the first quarter of this year. King says he has more than $800,000 of cash in the bank. Democratic challenger Christie Vilsack says she has raised more than $400,000 in the first three months of 2012 and has more than $900,000 of cash on hand. The new numbers mean King has raised just over $1.2 million for his campaign, while Vilsack has raised just over $1.5 million. That’s the toughest financial challenge Democrats have been able to pose for King, who is seeking his sixth term.