As Alex Roarty of National Journal reports:
The move is potentially helpful not only to the Democratic party but to that segment of the political class that might have been concerned about the Baucus moves toward comprehensive tax reform. This might have meant the loss of various loopholes, all of which would have been vigorously defended and many of those doing the defending would have been former Baucus staffers who have since gone to work on K Street. So the “reforms” might not have amounted to much even if Baucus had stayed on to finish his term and gotten the project underway.
So Baucus will leave behind business that might be best unfinished and a memorable prediction that the rollout of the Affordable Care Act – which had his fingerprints all over it – would be a “train wreck.”