Well I wouldn't say Gee Dubya has done the most to expand presidential power ever, that goes to FDR, definitely. But the civil works project, social security, those things were meant to pull our heads out of our butts after the speculatory and nationalistic markets of the 20s, not further the vicious cycle of debt and inflation like what's happening now.
And I agree with Alias, we need to sort out immediate security and monetary issues and then we can deal with social issues like guns, gay marriage, abortion, vouchers, etc. First things first is how I learned it.
Oh and supreme court justices... the court can be loaded to contain however many justices the Pres sees fit to appoint and the Senate sees fit to confirm, the Constitution doesn't specify a minimum or maximum, only that there must be a Chief Justice. Another technique FDR used to get his "social programs" approved was threatening to load the courts with judges that agreed with him. But, that doesn't mean that being on the Supreme Court doesn't change how a person votes. For example, Justice Souter was appointed by Bush Sr but is one of the liberal/libertarian judges on the court.
And last but not least CAV, you said, and I quote "Your understanding of the political process is simply incorrect... The Executive Brach has zero input other than a veto." While this is true if all you do is read the Constitution, if you take into account the politics of it all, the president (or the most powerful person in the dominant political party, or if we lived in the USSR, the secretary of the communist party, etc) gets his agenda accomplished through the use of lackeys.