Presidential résumés have run the gamut — from commanding general of the United States Army (Ulysses S. Grant) all the way down to collector of the Port of New York (Chester A. Arthur). Unfortunately, since George McGovern ruined the presidential nominating system in 1971, there has been a new potential item for the presidential CV: navigating the byzantine process of primaries and caucuses better than any competitor.
Not all eventual nominees have managed to do this (e.g. Gerald Ford was nearly outflanked in 1976, so was Ronald Reagan in 1980), and with only two presidents has this been a prime “qualification” for winning the nomination. The first was Jimmy Carter, whose insurgent campaign in 1976 exhibited an advanced understanding of the new, open process that now governs the selection of party candidates. The second was Barack Obama, whose campaign team grasped the seemingly inscrutable complexities of the new system better than anybody ever has. Breaking down the popular vote in the 2008 Democratic battle, it was a basically a tie; Obama defeated Hillary Clinton for the nomination because he out-organized her, especially in caucus states like Colorado, Idaho, and Minnesota.