Gerald Herbert/AP

MITT ROMNEY: Built a $200 million fortune in his private equity career.

SAUL LOEB/AFP/Getty Images

BARACK OBAMA: Book royalties alone ran to $2.5 million in 2008.

Evan Vucci/AP

NEWT GINGRICH: A $7 million fortune, with an up to $1 million revolving line of credit at Tiffany.

Robert F. Bukaty/AP

RON PAUL: Worth as much as $5.2 million.

Paul Sancya/AP

RICK SANTORUM: Disclosed last week that he earns roughly $1 million a year.