The Rise of Political Consultants: New Ways of Winning Elections. He is the co-author of Dirty Little Secrets: The Persistence of Corruption in American Politics with Glenn R. Simpson. In January 2011, he published Pendulum Swing, which analyzed the 2010 midterm elections and the potential effect of Republican Party victories on the 2012 presidential, congressional, and state-level elections. Prior to Pendulum Swing, Sabato authored The Year of Obama in 2009 and A More Perfect Constitution in 2007, which discussed his ideas for amending the U.S. Constitution. Other Sabato books include The Sixth Year Itch: The Rise and Fall of the George W. Bush Presidency, Divided States of America: The Slash and Burn Politics of the 2004 Presidential Election, and Get in the Booth! A Citizen's Guide to the 2004 Election, and writes for Sabato's Crystal Ball. He has written textbooks used by high school and college American government classes, and has been a frequent guest analyst on cable news outlets and radio programs. Investigation of Kennedy assassination His book The Kennedy Half-Century: The Presidency, Assassination, and Lasting Legacy of John F. Kennedy. was published in 2013. It focuses on John F. Kennedy's life, administration, and assassination and contains research from focus groups, polling, and interviews with colleagues and eyewitnesses. After analyzing evidence regarding the assassination, Sabato discredited the 1979 United States House Select Committee on Assassinations (HSCA) conclusion of a possible second shooter, stating that it was "blown out the water." Sabato's Crystal Ball Sabato's Crystal Ball is run by the University of Virginia Center for Politics in Charlottesville. The site contains analysis of an array of political races in the United States, including presidential elections, Senate, House, and gubernatorial contests. Predictions accuracy until 2016 Prior to the 2002 midterm elections, where the Republican Party saw gains in both branches of Congress, Sabato's Crystal Ball website accurately predicted the outcome in 433 of the 435 contests for the House of Representatives and 32 of 34 Senate races. In 2004, when Republicans retained the White House and gained seats in the House and Senate, Crystal Ball correctly predicted the outcome of 525 of the 530 political races (99% accuracy), missing only one House race, one Senate race, one governor's race and two states in the Electoral College. In August 2006, Crystal Ball predicted that the Democrats would gain 29 seats in the House of Representatives and 6 seats in the Senate,