"Signs point to yes"
If it really was Canadian (Alberta) tar sands crude going to a port in Maine, then sabotage certainly could be a valid idea.
Local Maine groups are complaining -
However the Sierra Club is complaining about a possible pipeline, when the present train system is probably more dangerous...
http://action.sierraclub.org/site/PageNavigator/CHP_Maine_NoTarSandsMainePetition.htm