http://www.nytimes.com/2013/12/13/opinion/brooks-strengthen-the-presidency.html?_r=0 (http://www.nytimes.com/2013/12/13/opinion/brooks-strengthen-the-presidency.html?_r=0)
In a nutshell: "If only the president had more discretion he'd be less prone to screw ups".
(Hat-tip to Gene Healy of the Washington Examiner/Cato Institute)