It's not by accident that they're called the Democrat party. They believe everything is subject to majority vote (unless it's a gay marriage referendum), and if 51% of the population votes to deny you life, liberty, and happiness, then tough sh*t for you. Mob rule by any other name.
It furthermore betrays a fundamental lack of intellectual grasp of why the Founders arranged it this way. Populous states of the original 13, such as New York and Virginia, would totally dominate small states like Connecticut if population alone was how we apportioned representation. They quite cleverly designed a bicameral legislature, with one house apportioned by population and the other by statehood alone.
Is it any surprise that he believes what he said? They've been working to dismantle the Electoral College for the exact same reason. Because, you know, the urbanites of NYC, LA, and San Fran should totally be able to dictate how people in places like South Dakota live their lives.