1. See Howard LaFranchi, “To Burnish Legacy, Bush Goes Abroad,” Christian Science Monitor, December 27, 2007.
http://www.csmonitor.com
/2007/1227/p01s02-usfp.html. But it is also true that other presidents have done the same. The National Taxpayers Union that follows this sort of thing notes that all two-term presidents since Eisenhower have averaged much more travel, in terms of days spent abroad, in their second terms.
2. See Table 3, Michael Tasselmyer, “Up in the Air: A Study of Presidential Travel and Its Uncertain Costs,” NTUF Issue Brief, June 26, 2013.
http://www.ntu.org
/ntuf/ntuf-ib-166-up-in-the-air.html (last accessed August 21, 2013).
3. Aaron Wildavsky, “The Two Presidencies,” Society 35(2) (January 1, 1998): 23–31.
4. See Frederick Paul Lee, “‘The Two Presidencies’ Revisited,” Presidential Studies Quarterly 10 (4) (1980): 620–628.
5. or Brandice CanesWrone, William G. Howell, and David E. Lewis, “Toward a Broader Understanding of Presidential Power: A Reevaluation of the Two Presidencies Thesis,” The Journal of Politics 70 (1) (2008): 1–16.