The Democratic base is made up of people who want/get something for nothing. These are people collecting food stamps, Section 8 housing, Medicaid, former recipients of unemployment who are now defrauding the disability system claiming they're "emotionally distressed", think the government should pay off their college loans, have a constitutional right to the forced labor of doctors, and are entitled to other people's money even though they made no effort to earn any of it.
The Democratic Party is a party based on envy, jealousy, and greed and that is what Romney was talking about in that clip. Anyone suggesting otherwise is being intellectually dishonest.