Sen. Jeanne Shaheen (D-NH) has signed a letter urging leadership to pass a public option via reconciliation, the 18th senator to do so.
Shaheen's office confirmed that she signed, following Sens. Chuck Schumer, Barbara Mikulski and Frank Lautenberg today.
The letter was written by Sen. Michael Bennet and will be sent to Majority Leader Harry Reid.
Other signatories so far: Sens. Bernie Sanders (VT), Al Franken (MN), Patrick Leahy (VT), John Kerry (MA), Sheldon Whitehouse (RI), Sherrod Brown (OH), Kirsten Gillibrand (NY), Jeff Merkley (OR), Dianne Feinstein (CA), Roland Burris (IL), Barbara Boxer (CA), Jack Reed (RI) and Tom Udall (NM).