Former Republican senator and Law & Order vet Fred Thompson is going public with the fact that he has been living with treatable lymphoma for some time - two and a half years, by one account - CNN reports. "This disclosure should indicate to everyone interested in seeing Fred enter the race for the White House how serious he is in taking the next steps toward launching a campaign," a political insider tells the news outlet. A press conference detailing the health of the potential presidential contender is slated for Wednesday afternoon.