Washington (CNN) The launch of Sen. Rand Paul's presidential campaign -- expected to be officially unveiled in Kentucky on Tuesday -- may not have been possible without the work of his father, Ron Paul, the former Texas congressman and three-time White House contender.

The elder Paul, who ran for president as a Libertarian in 1988 and a Republican in 2008 and 2012, helped pave the way for Rand Paul by building a nationwide network of devoted supporters drawn to his message of limited government and non-interventionist foreign policy. But while Rand Paul has largely inherited the ideological roots of Ron Paul's political philosophy, he's not a carbon copy of his father.

The two are similar in many ways—Ron Paul says he agrees with 99 percent of what his son believes. In some cases, they merely take different strategic approaches to reach the same goal, and in most cases Ran Paul's stance is a slightly more moderate version than his father's.

Still, Rand Paul expects to be treated as his own man, and in many ways he has proven to be a different type of politician. Here are some areas where they differ, even if slightly:

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