GOP presidential candidate Mitt Romney on Tuesday sought to blame President Obama for Congress’s failure to pass a farm bill this year.

“People have been waiting a long time for a farm bill. The president has to show the leadership to get the House and Senate together,” he said at an event in Iowa.

The 2008 farm bill expired on Oct. 1, and rules governing the farm safety net have reverted to those in place in the 1940s.

The Democratic Senate in June passed a five-year farm bill, as did the House Agriculture Committee, but House GOP leaders refused to hold a vote on the measure.

Democrats have been using the farm bill to hit Republican congressional candidates, especially in Iowa, which could move into Romney’s column after Obama’s lackluster debate performance last week. Rep. Steve King (R-Iowa) is running in a tight race against Christie Vilsack, the wife of Obama’s Agriculture secretary.

Romney released an agricultural policy paper on Tuesday that similarly lays blame at Obama’s feet for inaction on the farm bill.