This post has been updated to reflect that Pataki is officially running.
George Pataki announced his presidential candidacy in Exeter, N.H., on Thursday. He's the eighth official Republican entrant in the 2016 race for the White House. The field is expected to double over the next couple of months. Pataki has made numerous visits and a few friends in recent months in the Granite State, home of the first primary in 2016. Still, the mention of his name in most of the country might prompt questions of, "Who?" and possibly, "Why?"