Haley Barbour and Mitch Daniels are friends, and are said to have a gentleman's agreement that either one or the other will run, but not both. So this makes it more likely Daniels will run, if only because a potential disqualifying condition has been eliminated.
White House 2012 predicted that candidates would begin declaring or undeclaring very soon, and predicted that Barbour would decline to run, and also that Daniels would decide to run. So... well, he got one of them right, so maybe the other too.