She's the iconic leader who puts Donald Trump in his place, the woman with the toughness to take on a lawless president and defend American democracy. Ever since the Democrats took back the House in the 2018 midterm elections, Nancy Pelosi has led the opposition with strategic mastery and inimitable elan. It's a remarkable comeback for the veteran politician who for years was demonized by the right and taken for granted by many in her own party - even though, as speaker under President Barack Obama, she deserves much of the credit for epochal liberal accomplishments from universal health care to gays in the military. How did a 79-year-old Italian grandmother in four-inch heels become the greatest legislator since LBJ - and how will she manage her greatest challenge yet, impeachment?