The controversial Keystone XL pipeline was struck down for the second time this year, and once again President Obama’s fingerprints are all over it. In January, the Obama Administration made waves by vetoing the construction of the pipeline before the February 21st deadline, but on Thursday the president went further, personally calling a number of Democratic senators and urging them to vote against the pipeline in the Senate. The measure was ultimately defeated 56-42, although a number of Democrats sided with the Republicans in support of the bill.While this is technically a victory for the President, it is more Pyrrhic than sustaining. His green base will certainly be ecstatic at this news, but he has made the greens happy at the cost of tying himself and his party to the unpopular end of this bill. In the middle of election season, the president has handed the GOP a rare success for a party that has been consistently wrong-footed for the past few months.There are some rich greens who give money and there’s a green NGO machine, and the public (including Via Meadia) wants the environment protected, but many of the issues that matter most to professional greens are electoral poison. By blocking the pipeline and lobbying so heavily for it, President Obama has gamely swallowed one of the poison green pills; he has to hope now that its effects aren’t too strong.