The prospects for the Trans-Pacific Partnership (TPP) are not looking very good right now. Both parties' presidential candidates have come out against the deal. Donald Trump has placed it at the top of his list of bad trade deals that he wants to stop or reverse. Hillary Clinton had been a supporter as secretary of state, but has since joined the opposition in response to overwhelming pressure from the Democratic base.

As a concession to President Obama, the Democratic platform does not explicitly oppose the TPP. However it does include unambiguous language opposing investor-state dispute settlement mechanisms -- the extra-judicial tribunals that are an integral part of the TPP.

If the political prospects look bleak there also is not much that can be said for the economic merits of the pact. The classic story of gaining from free trade by removing trade barriers doesn't really apply to the TPP primarily because we have already removed most of the barriers between the countries in the pact.

The United States has trade deals in place with six of the 11 countries in the TPP, so tariffs with these countries are already at or very near zero. Even with the other five countries, in most cases the formal trade barriers are already low, so pushing them to zero will not have much economic impact.

In its analysis of the TPP, the non-partisan United States International Trade Commission (ITC) projected that the gains from the deal in 2032, when its effects will be mostly realized, will be 0.23 percent of the gross domestic product (GDP). This is a bit more than a typical month's growth. In other words, the ITC report implies that as a result of the TPP we can expect to be as wealthy on January 1, 2032 as we would be on February 10, 2032 without the TPP. That's not the sort of thing that would ordinarily be a cause for big celebration.

And the ITC model is explicitly a full employment model. It rules out the possibility that the TPP could lead to a higher unemployment rate as a result of increased imports displacing US workers. The ITC analysis also failed to include the negative growth effects of stronger and longer copyright and patent protection.

Both of these are forms of protection which translate into higher prices for drugs, software and other protected products. The losses from this increased protectionism can easily exceed the projected gains from the tariff reductions in the TPP.

The stronger patent and copyright protection are really at the core of the TPP. This is a deal that was crafted by and for the pharmaceutical industry, the software industry, the finance industry, the telecommunications industry and other major industry groups. We essentially asked the major firms in these sectors to tell us what they wanted in a trade deal and then the Obama administration tried to get it for them.

That doesn't make the TPP look like a good trade pact to most people, which is why it faces such bleak political prospects. But there is a lot of money riding on the TPP, so the Obama administration is not about to let it die a quiet death.

On the one hand President Obama has made numerous appeals to Democrats in Congress not to embarrass him by blocking his deal. As a president who is enormously popular among Democrats, this appeal carries some weight.

The president is also pulling out the China card, arguing that the TPP is necessary to create a trading block as a counterweight to Chinese power. Furthermore, Obama is arguing that not approving the TPP will damage our credibility with countries in the region.

It is difficult to hear this argument and not think back to the Vietnam War. The original argument for the war was to protect the right of the people of South Vietnam to determine their own destiny. At some point it became apparent to everyone that the South Vietnamese government was hopelessly corrupt and had almost no support from the population.

When it was no longer possible to argue based on democracy and self-determination, the Johnson administration argued based on credibility. They tried to make the case that if we allowed the South Vietnamese government to collapse, it would be devastating to our credibility in the region and the world. This argument was used to justify a war that cost the lives of tens of thousands of US soldiers and millions of people in Vietnam and neighboring countries. In the end of course, we left and the South Vietnamese government collapsed.

The Obama administration is now making its own credibility case about the TPP. If President Obama can't sell the TPP based on its economic merits, then it would be best to let it quietly die. "Credibility" is an ill-defined goal, and the quest for it can have very bad outcomes, as we saw in Vietnam. It's hard to see how we gain credibility by pushing a bad trade deal that was designed to serve the interests of our largest corporations. If we want a new trade deal with these and other countries, it would be better to go back to the drawing board and start from scratch.

- Dean Baker is Co-Director of the Center for Economic and Policy Research (CEPR) in Washington, D.C. He is the author of Getting Back to Full Employment: A Better Bargain for Working People [http://deanbaker.net/books/getting-back-to-full-employment.htm] among other books [http://deanbaker.net/].

-This article was published by Truthout on July 25, 2016