They would save money. He already gets a salary and they each are paid more than he is. He has incredible access regularly interviewing Senators. Most importantly it would improve coverage because he is not completely clueless about policy (or determined to pretend he is clueless which amounts to the same articles).
Murray and Montgomery write
But even Democrats who were not thrilled with the buy-in program applauded the deal's central component: replacing the public option with two national private insurance policies under the oversight of the Office of Personnel Management, the agency that administers health benefits for federal employees.
The Medicare buy in program is the deal's central component. It is more important than the feeble level playing field opt out public option. It is much more important than the change from a feeble public option to a feeble non-profit exchange = public option with actual services provided by non-profits.
The fact that an important step towards single payer is defined as a compromise compared to an unimportant step towards single payer shows how much the Senate debate is about who gets bragging rights (answer Joe Lieberman and Ben Nelson so why ask).
Note also the improper grant of anonymity. Who are those Democrats and why aren't they named ? Somehow I guess they are not named Brown, Wyden, Rockafeller, or Feingold. Why do they get to speak for "Democrats" ?
Later in the article un-named "aids" suggest that what's there's is there's and what's our is optional saying "But Democratic aides said the Medicare provision could still be dropped or altered before the measure advances to the floor." Who are they ? Why are they important people ? Maybe because they are quoted on the front page of The Washington Post ?