Not really (and I don't say that based on my leanings but my dh is in the business). I just don't really think The keystone pipeline would have possibly have much of an effect on near term gas prices. It would have produce jobs but even it were approved it has a whole bunch of lawsuits that are going to take years to settle.
Right now, the US demand for gas has been falling and demand plays a very small percentage of the cost of a barrell of oil. Right now 2 major things are effecting our gasoline prices.
1) Our refinery capacity is getting smaller. Oil companies are not making the huge profits on refinery oil simply because it's cheaper to ship in gasoline and fuel oil from India. India has been constructing mega oil refineries .
2) Middle east cartel. Remember the pipelines would just ship petroleum from Canada but the cost per barrel generally would not have been cheaper. Canada for the most part, follows the same prices as the Arab nations. So if the Saudias or the speculators raise the cost of a barrel of oil it's not like Canada is then going to say "hey we'll sell it for 10 dollars cheaper" and if I've read correctly, the crude coming for that project would actually be more expensive due to the fact is sand oil and is harder to extract. don't quote me on that though.
3) lastly China is also becoming a major consumer of oil so we know longer hold all the ace cards in the supply and demand equation. When we cut back we use to be able to wiggle a few price concessions out of the arabs but now some one else is buying. Think of it like this, 10 years ago I was the only one buying your widgets so I could go to you and ask you to lower your prices. Now unfortunately lots of other folks are buying those widgets.
I think the pipe line not getting approved is/was negligable.