When the media lie about the positions of candidates and introduce others as fringe canddidates, what support are these to get?
When candidates win or do well in debates, but are ignored in debate reviews, what are we to do?
When voters decide not to look at facts for themselves, the Republic is lost.
It's already lost, for the reason you state - dumb voters. In a better Republic, there would be voting tests for both intelligence and how informed the voter is.