A successful political revolution provides for some degree of change in leadership, whether that be Congress, the White House, the Governors mansions or at the local level. It can also include a change in direction of policy - say, getting us out of a war, or repealing tax cuts, or appointing more conservative or liberal judges than before.
But no revolution is successful without a sound, well thought out government plan to replace whatever government is being ousted. A change in faces without a change in policy does not make for a successful revolution.
Different levels of each of these can characterize many successful revolutions. When examining different revolutions, one can see many of these elements into play and casting their own shadow upon the specific revolution. With the theories and teachings of the Enlightenment ideals and the inspiration of the Romantic thinkers, the French Revolution was able to enjoy the benefits of "radical intellectual leadership." The Cuban Revolution sought to establish a new legitimacy with its overthrowing of the Batista government, which was seen as a pawn of the Capitalist West and denying economic rights to the national populace. The "Unresponsive Government" can be seen with the Russian Revolution, when the Provisional Government and then the Communists were able to assert their claim to power from a weakened Czardom in the wake of World War I. Finally, in the American Revolution, the issue of "rising expectation" could be seen when the Colonists sensed their own independence as a reality after their support of the British in the French and Indian War. In each revolution, some component of the ones listed above has relevancy and meaning.