It has been rare in American history for presidents and vice-presidents not to get along, but it has happened on a few occasions: Adams and Jefferson, Kennedy and Johnson, and Eisenhower and Nixon are a few examples (Jackson vs. Calhoun-Part 1 1). However, the most controversial relationship between president and his assistant was between Andrew Jackson and John C. Calhoun. Their disagreements began very early on in Jackson's administration, and lasted until after the resolution of the Nullification Crisis. Nullification is the refusal of a state to recognize a federal law within its b…