From Politico:

Senate Majority Leader will announce this afternoon that he plans to push ahead with a public option vote — one that includes an opt-out provision for states — even though he’s currently short several votes for passage, according to people close to the situation.
The Nevada Democrat has a 3:15 p.m. press conference to discuss details — and his staff has scheduled a closed-door huddle with Democratic legislative directors to map out the road ahead.
Leadership sources tell me that Reid, who spoke with virtually every member of his 60-member caucus this weekend, currently has between 56 and 57 votes for the opt-out, which is being pushed by Sen. Charles Schumer, according to Democratic aides.
A public option with a delayed “trigger” — supported by the White House and Maine Republican Sen. Olympia Snowe — has between 58 and 59 backers.
No decisions have been made — but the trigger plan could be floated as an alternative if the opt-out measure fails to obtain the 60 votes needed for cloture, sources said.
Reid worked most of the weekend, convening several meetings with his leadership — and wrangling over the details with White House Chief of Staff Rahm Emanuel.
Reid’s decision comes at a time when many in the midst of the Senate negotiations are expressing frustrating that the White House hasn’t articulated a clear preference for what form a public option should take — or even if the public plan is a pre-condition of any deal.
Late Sunday, in response to reports of sniping, Obama’s Deputy Communications Director Dan Pfeiffer posted a blog entry in the White House Web site claiming that “rumors” Reid and Obama were pushing different plans were “absolutely false.”