American Presidency

How should we classify the last four Presidents (Clinton, G.W. Bush, Obama, Trump) in political time? Feel free to categorize them however you see fit, but defend your classification. classify them in a way that is consistent with Skowronek’s overall theory; if you depart from the theory, be sure to explain and defend that decision.
The system by which we elect Presidents in the United States is often criticized. Primaries, campaign finance, advertising, campaign rhetoric, and the Electoral College are all popular targets, and there are plenty more potential issues. Is the presidential election system fundamentally broken? If not, why does it receive so much criticism? If so, how can we fix it?