Schumer is the now the chief lunatic at large in the senate. The torch has been passed. Here's an excerpt from the NY Times that explains a bit about how the replacement will be chosen:
Senator Edward M. Kennedy has asked the Massachusetts Legislature to change state law to let the governor, currently a fellow Democrat, fill vacant Senate seats. Abandoning the current system, in which voters choose, would be undemocratic, even at the request of such a respected lawmaker.
With the health care battle heating up in Washington, every senator’s vote is critical. It is not hard to imagine that Mr. Kennedy, who has made national health care a high priority, wants to make sure Democrats will not lose a vote if he is unable to keep serving because of his terminal brain cancer. Under current law, an empty Senate seat can be filled only by special election, which could leave the seat open for more than five months.
Massachusetts governors used to fill Senate vacancies. But in 2004, the Democratic majority in the State Legislature changed the law to require a special election. The leaders were concerned that if Senator John Kerry was elected president, Gov. Mitt Romney would appoint a fellow Republican. To change back now would look like an unseemly amount of partisanship in setting the rules for who goes to Congress.