Saturday's Republican primary race in South Carolina gave a big boost to political outsider Donald Trump, and left many Republicans stunned when the establishment candidate, Jeb Bush, dropped out of the race. Geoffrey Cowan's new book traces the history of the presidential primary process from its first days in 1912. 

Voter turnout for Tuesday's March Primary Election has been low, and less than 9 percent of registered voters in Chicago have cast ballots as of 6:00 pm. Voters today will determine who will appear on the November ticket for Republican and Democratic races ranging from governor to the state legislature. Read an article.

Paris Schutz reports on why some powerful unions are urging Democratic members to cross over and vote Republican in next week’s gubernatorial election. Read an article.

Welcome to Chicago Tonight’s online coverage of the 2014 race for Illinois Treasurer. You can read profiles of the candidates and catch all of their appearances on Chicago Tonight.

Tuesday, Oct. 21: Illinois Treasurer Forum

Welcome to Chicago Tonight’s online coverage of the 2014 race for the U.S. Senate. You can read profiles of the candidates, view timelines of their careers, and catch all of their appearances on Chicago Tonight.

Wednesday, Oct. 22: U.S. Senate Candidate Forum

Mike Webster is a Republican running for Secretary of State against incumbent Jesse White.

Illinois voters are weighing in on presidential nominees in the Republican primary, and congressional and legislative races. Elizabeth Brackett reports.