Former Florida Gov. Jeb Bush is one of four "un-candidates" being targeted by liberal groups Campaign Legal Center and Democracy 21. They say the politicians have crossed the line into candidacy based on their activities in recent months. Scott Olson/Getty Images hide caption

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Would-be presidential candidates are ditching "testing the waters" and "exploratory committees" to hold onto unlimited and undisclosed cash for longer. Mark Wilson/Getty Images hide caption

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Former Secretary of State Hillary Clinton receives the Liberty Medal in 2013 from the National Constitution Center. Former Florida Gov. Jeb Bush was the group's honorary chairman. Both are now likely presidential candidates for their respective party's nomination. William Thomas Cain/Getty Images hide caption

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Former Florida Gov. Jeb Bush speaks to members of the media during a two-day swing through Iowa that had all the trappings of a presidential campaign. Charlie Neibergall/AP hide caption

itoggle caption Charlie Neibergall/AP

Former Florida Gov. Jeb Bush addresses an education conference Thursday sponsored by the Foundation for Excellence in Education, a nonprofit he created as he left office. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP