On March 4, 2008, Hillary Clinton won surprise victories in primary elections in Texas and Ohio. At first, it seemed to be a momentous shift of the race for the Democratic presidential nomination, making Barack Obama's victory seem not so inevitable after all, as some had believed it to be since he won the Iowa caucus two months before.

But it quickly became apparent that Clinton's popular-vote wins were almost meaningless. In the contests that took place that day, Obama had actually garnered more delegates than Clinton. His march to the nomination continued unabated. By executing a carefully planned strategy of delegate accumulation and worrying less about the campaign's daily ups and downs, Obama bested a more seasoned rival to become the Democratic candidate.