Most estimates place the number of undecided, or at least uncommitted, members of the full Senate at 20 to 30.

Last-minute horse-trading with several undecided members also continued today.

The two undecided members continued to weigh their options.

So the focus comes back to those 30 or fewer truly undecided members, most, but not quite all of them Republicans.

But they could appeal to undecided members, because of the substantial volume of support on both sides of the issue.

The group has also produced radio commercials aimed at undecided members of Congress.

"We're right at the precipice," he told an undecided member who called.

This is not uncommon for undecided members or those from difficult districts.

The balance of power in Congress was close, with some members still undecided between the parties.

Several previously undecided members of Congress said they would support the free-trade pact.