Actually, as anyone who follows the news would know, that is not "misinformation." Pres. Obama explicitly discussed cutting off health care for the elderly ("Maybe this isn't going to help. Maybe you're better off not having the surgery, but taking the painkiller') as a cost-saving measure in his June 24, 2009 national press conference. The video is here and this blog previously discussed it here.
Around the country, the debate over overhauling the nation’s health care system has grown increasingly bitter and divisive.
From Connecticut to California, angry demonstrators opposed to health care reform have disrupted town hall meetings held by congressional Democrats. They attack lawmakers for backing a “socialist agenda,” shout questions without waiting for answers and repeat misinformation as fact, in some cases even accusing Democrats of favoring mandatory euthanasia for senior citizens. [Emph. added]
On the other hand, if one distinguishes between passively denying care to the elderly, as Obama suggested, and actively committing euthenasia, then Goldstein's quote is even more fishy: it sounds like something the Democrats made up.