Iowa Republicans topped Democrats in statewide registration numbers for the fourth straight month. The latest numbers released by the Iowa Secretary of State show Republicans with an edge of more than 21,000. Last month, Republicans outnumbered Democrats by 12,513.  Iowa Democrats held the registration edge from 2006 through March of 2012.

There are now 619,452 registered Republicans in the state, compared to 598,074 Democrats. The gains can be attributed to a several factors: the failed policies of President Obama and the Democratic Party as a whole, the groundwork laid by the 2010 Branstad campaign, Iowa Victory program and previous RPI Chair Matt Strawn, the Iowa Caucuses, particularly Ron Paul’s campaign, and several competitive House and Senate primary contests in June.

“More than three years of President Obama’s failed economic policies have led to record unemployment, higher food and gas prices and historic levels of debt,” said Republican Party of Iowa Chairman A.J. Spiker. “Hard-working Iowans see the problems in the Democratic Party’s policies and see the greater opportunities that the principles of the Republican Party can provide.”

The main beneficiary of these new totals is Congressman Steve King. There are now 53,214 more Republicans than Democrats in the 4th Congressional District. That is a gain of 4,969 from last month’s totals. Republicans in the 4th District also outnumber independents by more than 12,800.

The numbers are also good news for Congressman Tom Latham. Republicans outnumber Democrats in Iowa’s 3rd Congressional District by almost 15,000. That is a gain of 3,535 from last month.

Here is a complete breakdown of the new voter registration totals, by congressional district: