Claire McCaskill won her first election in high school. After fulfilling her duties as homecoming queen, she set her sights on public service. McCaskill worked as a waitress while earning her law degree and went on to serve as Jackson County Prosecutor, a member of the Missouri House of Representatives and the state's auditor. When she defeated Republican incumbent Jim Talent in 2006, she made history as the first woman Missouri elected to the U.S. Senate. Tonight at 5 p.m., St. Louis County Library Headquarters (1640 South Lindbergh Boulevard, Frontenac; 314-994-3300 or www.left-bank.com) and Left Bank Books welcome the senator for a book signing and onstage interview to discuss her newly released memoir, Plenty Ladylike. Individual tickets cost $35 and include a copy of Plenty Ladylike. The $45 package ticket admits two and also includes one copy of the book. Proceeds benefit the Library Foundation's literacy programs.