Two different candidates, Hillary Clinton and Bernie Sanders, see two different paths to winning a general election.
For Sanders, whose ability to win a general election has been questioned, it's all about rousing the base with enthusiasm to turn out.
"Democrats win when there is a large voter turnout, when people are excited," he said. "Our campaign, up to now, has shown that we can create an enormous amount of enthusiasm from working people, from young people, who will get involved in the political process."
In many ways, the Sanders strategy is similar to that of Ted Cruz on the Republican side, whose campaign has studied the grass-roots strategy of President Obama's former campaign manager, David Plouffe, in trying to expand the electorate.
Clinton, meanwhile, believes passion pales next to experience and the ability to withstand "the spotlight."
"I've been vetted -- there's hardly anything you don't know about me," she said, warning that the eventual nominee "will face the most withering onslaught."
"It's not so much electability," she added. "It is who the American people believe can keep them safe, can get the economy moving again."