>> glor: f. scott fitzgerald famously said, "there are no second acts in life." he never met jimmy cow passes g. here's chip reid. >> my name is jimmy carter, and i'm running for president. >> reporter: many historians rank jimmy carter as a below-average president, but in the 38 years since he left office, he's become perhaps the most accomplished ex-president in american history.an history. he's worked on more than 4,000 homes for habitat for humanity. >> sometimes the work is very hard. >> reporter: he's traveled the world promoting human rights and monitoring elections, and in 2002, he became the only u.s. president to receive the mow bell peace prize for work done after his time in office. >> the last 20 years of my life