As the Midwest continues to suffer through its worst drought in more than 50 years and corn prices near record highs, sixth generation farmer Pam Johnson stares out her window, praying for rain. "We went into this year having planted more acres than we had planted in many years, expecting to raise a bumper crops," said Johnson, who farms with her husband, two sons and their families in Floyd, Iowa. "The planting conditions were great, and our corn came out picket-fence perfect. But now we have no idea how…