well, let's do the math...
Pat Buchanan runs for President and gets...
2,899,488 votes - 1992 (primaries)
3,184,943 votes - 1996 (primaries)
449,225 votes - 2000 (general)
Barack Obama runs for President and gets...
17,535,458 votes - 2008 (primaries)
So I figure that makes Obama about 5-6 times more "mainstream" than that rightwinger Buchanan...
