Sen. Bernie Sanders (I-VT) believes that Democrats have the 60 votes they need to stop a Republican filibuster of the healthcare bill. Ultimately, several Democrats will vote against the bill, but he thinks cloture will pass.
Sanders may be a little early in thinking they can reach 60 votes. While cloture isn’t an actual vote for the legislation, it can be viewed as such. If you know a bill will pass because you vote to stop debate, then you’re complicit. Those voting for cloture can be sure they will face tough questions from their constituents as a result. Every moderate senator knows this. A cloture vote won’t pass unless a reasonable compromise is reached.