Here.

Elitism is a sense that the hoi polloi are simply incapable of governing themselves, let alone a nation, and that a small group of "experts" have to take control of everything they do. That goes far beyond mere matters of state. Elitists see people getting more obese and believe that government has to intervene to remove food choices from individuals, as one rather timely example, as in New York City. They believe that removing personal choices will keep people from making bad decisions, because they--in all their wisdom--will make the right choices for them.

This describes perfectly the policy direction of the Democratic Party, and perhaps even a part of the Republican Party as well. That's why the charge of elitism sticks so well to Democratic candidates in national elections. Their humble origins are immaterial to the concept of elitism. Candidates who want to grow the federal government in order to increase its nanny-state power are by definition elitists, because they believe individuals cannot make choices for themselves.