Take the GOP Candidates Quiz

How well do you know the conservatives vying for the White House in 2012? Take ProPublica’s GOP candidates quiz to find out, then bone up with its comprehensive 2012 Presidential Campaign Reading Guide. —ARK

ProPublica:

9) Which candidate has campaigned on eliminating the payroll tax?

- Newt Gingrich
- Mitt Romney
- Rick Perry
- Ron Paul
- Michele Bachmann
- Herman Cain

Take the quiz

AP / Jae C. Hong

GOP presidential hopefuls debate at the Reagan Library on Sept. 7.