(CNN) - Democratic Sens. Blanche Lincoln, Mary Landrieu and Ben Nelson, who have all expressed skepticism about the party's health care reform plan, were summoned to Senate Majority Leader Harry Reid's office Wednesday to get a sneak peak at his health care bill.
Reid spokesman Jim Manley said Wednesday the senator invited these three moderate Democrats into his office to give them the "particulars on the bill."
All have been withholding support on voting to start debate - and the fact that Reid is giving the three their own special briefing, before the broader Democratic meeting at 5 pm Wednesday, is a signal of their power.
Assuming no Republican senator joins Democrats in voting to end debate, Reid needs all 60 senators in his party's caucus to vote in favor of a so-called "motion to proceed."
If any Democrat votes no on proceeding to debate, Reid's health care bill will go down before it starts.
A source familiar with Nelson's thinking reminded CNN Wednesday that has historically supported beginning debate, and does not believe that has anything to do with whether he will support a final bill. Landrieu told CNN she is leaning toward a "no" vote on the motion to proceed.
Manley says Reid still believes the Senate will vote on the motion to proceed this Saturday.