This could be a problem for John Adam because Thomas Jefferson belonged to the Democratic Republic party. Thomas Jefferson first of all pressured a lot of his party's ideas down onto him to support it. After 4 years of this, there friendship separated very much. It got way worse, when Thomas Jefferson was candidate for president and won against John Adam. After that incident, John Adam completely ignored Thomas Jefferson. The most ironic thing is that even thought there friendship slipped of, they died the same day of July 4, 1826.