More "Big Mo"

I believe the term was coined by George H.W. Bush after winning the 1980 Iowa caucus. Ironically, the victory did not give him momentum:

This approach brought Bush victory in the Iowa caucus, where Reagan scarcely campaigned. With the national spotlight shining on him the weeks before the crucial New Hampshire primary gave him the opportunity to explain with Reganesque clarity what he would do if elected. Instead, Bush prattled away that he had the big momentum--the "Big Mo"--which suggest to conservatives that he was not a leader who took their causes with due gravity. Bush later confessed that such "preppy phrases" gave "an impression that my campaign lacked substance." In New Hampshire, Reagan turned the tide, besting him by more than two to one......