Sen. Roger Wicker, center, looks over historic letters and memorabilia in the Ulysses S. Grant Presidential Library during a Wednesday visit. Ryan Semmes, left, assistant professor with Mitchell Memorial Library, and John Marszalek, executive director and managing editor for the Grant Library and the Ulysses S. Grant Association, look on. Semmes and Marszalek served as Wickerâs guides through the collection.