This article was published before the actual vote so there's a discrepency in the names but the number is correct (3)
WHY ARE THEY CAVING? This from Congressional Quarterly:
At least three Democrats — Mary L. Landrieu of Louisiana, Joseph I. Lieberman of Connecticut and Ben Nelson of Nebraska — plan to support cloture on Bolton, according to Senate Democratic aides. All were parties to the bipartisan compromise on judicial filibusters struck earlier this week by seven Democrats and seven Republicans. Dianne Feinstein, D-Calif., was also seen as “likely” to vote “yes.”
Ohio Republican George V. Voinovich, who opposes Bolton, has also said he will support cloture. Sen. Mark Pryor, D-Ark., another signatory to the deal on judicial nominations, remains undecided on cloture, according to his office.
At this point it’s important to remember that the chairmen and ranking members of the Senate Foreign Relations Committee and Senate Select Committee on Intelligence have been denied full access to the NSA intercepts that John Bolton and his staff were able to see without issue. A useful way to view the administration's instransigence over the intercepts is to consider that by withholding full access to those intercepts, the Bush administration is attempting to assert an inherent superiority over the legislative branch. Thus, those who vote for cloture tonight will contribute to the establishment of a precedent whereby the executive branch can ignore Senate inquiries willy-nilly.
Now, that may be perfectly acceptable if you are a Republican and your man controls the White House, but for a Democrat to confirm one’s subservience to the executive would be insanely contrary to the party’s collective interest.
--Mark Leon Goldberg
http://www.prospect.org/weblog/archives/2005/05/index.html#006592