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Couldn't win. he was unelectable. do you remember that guy? what is his name? oh, it's president obama! >> reporter: sanders presented himself as a principle progressive, drawing a sharp cra contrast to clinton. >> i will not abandon any segment of american society just because it is politically expedient at a given time. >> reporter: former maryland governor martin o'malley said it's time for a new generation to lead. >> new leadship are the same old battles of our past. actions or words? do we want to get things done? or with do we just want to keep kind of shouting past each other? >> repor...

A marquee event for democrats. it was at this dinner eight years ago where illinois senator barack obama jump-started his presidential campaign. >> if we are really serious about winning this election, democrats, then we can't live in fear of losing it. >> reporter: sanders said history could repeat itself. >> about eight years ago, all of the political experts talked about how another democratic candidate for president just couldn't win. he was unelectable. do you remember that guy? what is his name? oh, it's president obama! >> reporter: sanders presented himself as a principle progressive, ...