In order for democracy to function properly, one of its requirements is that the electorate have sufficient knowledge of all candidates running for any given political office. So what percentage of the modern public goes out of their way to research all competing candidates instead of just passively swallowing the political propaganda in the news and in the universities in small increments over time? Not enough.
It stands to reason that if suffrage is a vital human right, it follows that there should be a mandate that the citizen have a healthy knowledge of each candidate. Not only should the citizen know that, but he should have a solid understanding of economics, history, and the political process. What percentage of the public is defined by these attributes?