Mike Allen has the goods:

Advisers to Fred Thompson have begun exploring a range of staffing options -- including talking to potential campaign managers -- as the actor and former Tennessee senator firms up his plans to enter the Republican presidential contest, according to people involved in the conversations.

Thompson has not made a final decision but is on track to be ready to announce his candidacy in June or July, his advisers say.

Originally I thought it was less than 50/50 Fred Thompson would get in the race, but after the last few weeks of interviews, disclosures, op-eds, and high profile speaking engagements, it now seems easily better than 50/50 he will get into the race. At this point if Thompson chooses not to run he probably still takes the title from Colin Powell for biggest flirtation with a Republican presidential run in recent history.