Fox News is reporting John Thune will be a guest on a New Hampshire radio station tomorrow, marking his first appearance in that state's political scene. New Hampshire hosts an early Republican Presidential primary and winning this state is critical for the momentum of a candidate.
Also, Thune will be a speaker at CPAC, a national conservative gathering next February. Traditionally, this platform is used to gain national name recognition and bolster conservative support - possibly before running for President.
These two events serve as indicators that Thune either seriously considering or is already planning on running for President. You can read the article "Thune Looking More and More Like a Presidential Hopeful" here.