The House today will consider legislation that would give President Obama so-called fast-track trade authority. It promises to be a close vote.

The success of the latest plan for advancing the president’s trade agenda will likely depend on whether a small group of pro-trade Democrats support the bill. That will come down to how sure they are that Congress will separately send the president legislation that would provide assistance to workers hurt by trade deals.

The key word for the day is trust.

The Washington Post’s Paul Kane explains:

Republicans must trust Democrats, and Democrats must trust Democrats, and most of all they must put their faith in Obama to back up all the commitments made in the past week.

“Trust, trust is the key; you got it, trust,” Sen. Thomas R. Carper (Del.), the most ardent Democratic supporter of the trade agenda, said Wednesday before meeting with the president.

“Trust rules the day, a lack thereof destroys it.”

The first step comes Thursday when the House expects to hold another vote on Trade Promotion Authority, the legislation that would give Obama fast-track powers to conclude a sweeping 12-nation deal with nations along the Pacific Rim.

It’s part of a complicated series of moves to get around a blockade set up by liberal House Democrats against the president’s trade agenda. The original plan was complicated enough — four separate bills, two of them packaged in one piece for the Senate, but then split apart for House consideration into four votes. Now that the initial path blew up last week, Obama’s supporters have crafted an exponentially more difficult bridge to revive and approve the trade legislation.