Congressman Rehberg's official statement was a bit more forceful. It reads in part:
"Today’s shameful decision by President Obama to put his re-election ahead of thousands of jobs for American families shows just how much this Administration and its allies have bought into the radical anti-job agenda of environmental extremists like the League of Conservation Voters."
The Tester campaign has been attempting to show how Congressman Rehberg looks out for himself and represents the interests of the Republican Party nationally, not Montana. Rehberg is "not one of us" but "one of them"--a tool of the Republican Party bosses. Senator Tester, according to this narrative, is an independent, bipartisan voice for the state. The Tester campaign pushes back, saying that Senator Tester is his own man and not beholden to President Obama, noting the instances where he has broken from the administration and national Democrats (e.g, the administration's job bill or the DREAM Act).
This is what we call framing in the business. Campaigns seek to advance particular narratives and discuss events in terms of that narrative. What is interesting in the Montana Senate race is how important it is in a rural, agricultural state like Montana to be perceived as "one of us" by the voters. Politics is about identities, and the identity of who is most like Montanans is an important point that the campaigns have contested from the very beginning of this race. Part of being "one of us" is making decisions that a regular Montanan would make in Washington. And both campaigns claim that they do a better job of doing on Capitol Hill what the average Montanan would want.
Both campaigns responded to the Keystone decision rapidly, and Montana Republican Party has even sent out an e-mail in an attempt to raise funds. Both sides used the opportunity to return to their core narratives of who is doing the best job in Washington and who has Montana's interests best at heart.
It should be noted that the Obama administration did not cancel the project on the merits, but argued that the 60-day deadline imposed by Congress did not allow for a full review of the project. The Canadian company can apply for a permit again, but the delay will certainly prevent any construction jobs from going online before the fall election.