While Republican presidential front-runner Mitt Romney argues that his opponents have no realistic shot at winning enough delegates to secure the nomination, the same could eventually be true for Romney if a four-way race continues. NPR takes a look at the latest delegate numbers.

While Republican presidential front-runner Mitt Romney argues that his opponents have no realistic shot at winning enough delegates to secure the nomination, the same could eventually be true for Romney if a four-way race continues. NPR takes a look at the latest delegate numbers.