Lieberman's shift?

His office's explanation of his new opposition to allowing people older than 55 to buy into Medicare, something he seemed to support quite recently:

Senator Lieberman's [support of a Medicare expansion] reported by the Connecticut Post in September was made before the Finance Committee reported out the Baucus bill, which contained extensive health insurance reforms, including a more narrow age rating for pricing health insurance premiums and extensive affordability credits that would benefit this specific group of individuals. These health insurance reforms and affordability credits have been strengthened in Senator Reid's Patient Protection and Affordable Care Act and will provide even greater relief for those 55-65 years old. Any inclusion of a Medicare buy-in for that same age group would be duplicative of what is already in the bill, would put the government on the hook for billions of additional dollars, and would potentially threaten the solvency of Medicare, which is already in a perilous state.

The question of Medicare's solvency isn't new, so Lieberman's central point seems to be that he prefers the way the Baucus bill deals with people 55 and over.