WASHINGTON — A senior Democratic senator who helped write President Barack Obama's health care law stunned administration officials Wednesday, saying openly he thinks it's headed for a "train wreck" because of bumbling implementation. "I just see a huge train wreck coming down," Senate Finance Committee Chairman Max Baucus, D-Mont., told Obama's health care chief during a routine budget hearing that suddenly turned tense. Baucus is the first top Democrat to publicly voice fears about the rollout of the new health care law, designed to bring coverage to some 30 million uninsured people through a mix of government programs and tax credits for private insurance.