By Allison Yarrow
Republican presidential candidate Newt Gingrich has gone from also-ran to front-runner overnight. He led a back-bench conservative revolution in the House, claiming the speakership before being pressured out by his own troops. His intellect is as boundless as his capacity for missteps. Peter Boyer talks to Gingrich about his comeback, his darkest hours—and what he has in common with Bill Clinton—in the new Newsweek. A look back at the crucial moments in an outsized career.