Sen. Lindsey Graham of South Carolina 鈥 whom Rush Limbaugh has dubbed 鈥淟indsey Grahamnesty鈥 for his support of immigration reform 鈥 may end up with less than 50 percent of the primary votes, and thus face a runoff.
John J. Pitney Jr. is the Roy P. Crocker professor of American politics at Claremont McKenna College and coauthor of 鈥淎fter Hope and Change: The 2012 Elections and American Politics.鈥