a) it's a nasty slur for poor southern whites and b) whatever else he is (and he's a lot of things) he's no cracker.

Cracker, sometimes white cracker, originated in the 18th century. There are many theories of its origins, most going back to the days of slavery. In its pejorative form it is often used as a racial slur.

One theory holds that the term comes from the common diet of poor whites. Britannica notes that the term derives from the cracked corn from which cornmeal and grits, which formed their staple food, are made, as well as corn whiskey.[2] Historians point out the term originally referred to the English and Scots-Irish farmers of the back country (as opposed to the wealthy planters of the seacoast). As sociologist Horace Kephart reported in 1913: "As the plantations expanded these freed men (formerly bond servants) were pushed further and further back upon the more and more sterile soil. They became 'pinelanders', 'corn-crackers', or 'crackers'."[3]

http://en.wikipedia.org/wiki/Cracker_%28pejorative%29

Richard Nixon was the whitest, most uptight and humorless person I have ever seen run for any public office. Compared to Romney, Nixon looks almost like James effing Brown. Almost.