This looks promising:

Ben Nelson will once again be playing a key role in Senate negotiations over a major legislative drive. The centrist Nebraska Democrat told reporters Tuesday afternoon that he does not currently support the Employee Free Choice Act — also known as card check — a bill that would allow workers to choose to unionize either through a secret ballot or by signing cards of support.

“I’m not in favor of the bill as it — I haven’t seen exactly what was put in, but if what was put in is the same as it’s been described, I’m not in support of that,” he said.

Nelson, as he almost always does, left a window open. “But I also believe there’ll be a major effort to modify it before it ever comes for consideration, and I’ll have to take a look and see what it is then,” he said.

Word on Capitol Hill is that a compromise has been floated which removes the section that eliminates the secret ballot and waters down the arbitration power of the government.  It may shorten the time required for a secret ballot election to be held after getting cards signed.

If Nelson bails on Card Check, expect Landrieu, Pryor, and Lincoln to follow suit.