Can epistocracy, or knowledge-based voting, fix democracy?

Elected officials tend to pass laws they believe will appeal to the median voter. A politician on the left or right usually can win more votes by moving to the center, a theory you can see in action by watching how presidential candidates soften their policies after the primaries. The median voter wields great power over what politicians ultimately do. But -- and here's the problem -- the median voter would fail economics or Political Science 101. For 60 years, political scientists have studied what voters actually know.