I would say that there is a specific bias here that is actually helpful. People tend to vote mostly on the issues that they care most about; and, generally speaking, those also tend to be the issues they know most about. Person A, B, C, and D might on average not know a lot about education, environmental issues, finance, and technology, but if person A votes for the candidate mostly based on his positions and performance on educational issues and person A knows and cares a lot about education,person B votes for the candidate mostly on environmental issues and he knows a lot about environmental issues, person C is a finance expert who votes based on financial issues, and person D is focused on science and technology and votes based on science and technology issues, then candidates are motivated to preform well on all four issues even though only 25% of the voting population properly understands each specific issue.
I would say that there is a specific bias here that is actually helpful. People tend to vote mostly on the issues that they care most about; and, generally speaking, those also tend to be the issues they know most about. Person A, B, C, and D might on average not know a lot about education, environmental issues, finance, and technology, but if person A votes for the candidate mostly based on his positions and performance on educational issues and person A knows and cares a lot about education,person B votes for the candidate mostly on environmental issues and he knows a lot about environmental issues, person C is a finance expert who votes based on financial issues, and person D is focused on science and technology and votes based on science and technology issues, then candidates are motivated to preform well on all four issues even though only 25% of the voting population properly understands each specific issue.