I'm a little delayed on this, but the Keystone decision probably won't happen until after November elections. In that case we'll see whether my prediction that it will go down, if delayed that long, gets verified. Roger Pielke Jr's prediction of approval in February 2013 just keeps getting wronger.
The best political outcome for Democrats is to never approve or disapprove the pipeline, but there's got to be a limit to delay (I think). Still, delay's a partial victory, and it's that much more time for the Canadians to come to their senses and elect a non-idiot as PM.
Not much sense in the first link to Bill McKibben being upset about the delay, unless he figures it's not really about the pipeline at all but about organizing a movement to either build on a victory or to lead the charge against a wrong decision. Hard to organize a movement over some governmental thing that just keeps being nebulous.
I still think that no matter what, this will be part of the 2016 presidential election.