Rep. John Dingell, D-Mich., the longest-serving member of Congress, is celebrated by colleagues, including Vice President Biden, on Capitol Hill in June 2013. A former chairman of the Energy and Commerce Committee, Dingell, now 87, announced in February that he will retire after this term. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

A lot more people now know who Iowa Republican Senate candidate Joni Ernst is, which was the point of the hog-castration line in her campaign ad. YouTube screen shot/Joni Ernst for Senate YouTube channel hide caption

itoggle caption YouTube screen shot/Joni Ernst for Senate YouTube channel

Dr. Tim Ihrig, a palliative care physician, treats Augie Avelleyra, 93, at his home in Fort Dodge, Iowa. Courtesy of Paula Avelleyra hide caption

itoggle caption Courtesy of Paula Avelleyra

Soil erosion after five inches or more of rain fell in one hour across portions of Western Iowa in 2013. USDA Natural Resources Conservation hide caption

itoggle caption USDA Natural Resources Conservation

Iowa Supreme Court Justice David Wiggins, right, faces a retention vote Nov. 6. Charlie Neibergall/AP hide caption

itoggle caption Charlie Neibergall/AP

Rep. Paul Ryan, who has been chosen by Mitt Romney to be his running mate on the GOP ticket, greeting supporters Sunday in his home state of Wisconsin. Ryan will be in Iowa today. Saul Loeb/AFP/Getty Images hide caption

itoggle caption Saul Loeb/AFP/Getty Images

President Obama meets with Jason and Ali McLaughlin and their son, Cooper, while visiting their home in Cedar Rapids, Iowa. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

President Obama tours Conveyor Engineering and Manufacturing in Cedar Rapids, Iowa, on Wednesday. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images