Keystone Pipline

I have what appears to be a simple question. Apparently, it isn't all that simple.The Democrats, who have been against the Keystone Pipeline, are now pushing for a vote on it. The Republicans are happy to accomodate them. The president is against it and is threatening to veto any legislation which would permit it.

It all seems to revolve around Senator Mary Landrieu and her fight to retain her seat in the Senate. If she somehow wins re-election in the run-off, will she retain her support for the pipeline? Will the rest of the Democrats also retain their support for it?

The politics are obvious. I think it is all for show. If the Democrats pass the legislation and the president vetoes it then will that help Landrieu in her re-election? She could say "Well, I tried" and that might be enough for Louisiana voters. It would not be enough for me but I wouldn't be inclined to vote for her anyway.

I believe the pipeline would be good for the country. You may not believe that is so. I would be interested in your opinions. 
The Senate failed to pass the pipeline legislation. It garnered 59 votes and needed 60.