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You'll have to blame the expansion of executive power not on Obama but on Jefferson & Madison, who enlarged those powers enormously through the Louisiana Purchase. The constitution has never been as fixed as the Ten Commandments (hence major amendments in, for example, 1791, 1795, 1870, and the 1960s). The Cornell Law School "explanations" of the constitution, especially the pieces around Article II, which deal with the Executive Branch of US Government. There, you'll find summary and explanation notes on the many practices, court cases, and decisions that have shaped the Constitution since its origin: https://www.law.cornell.edu/anncon/html/art2frag3_user.html#art2_hd13