mayor chris coleman of st. paul, we thank you for talking with us.and good luck with dealing with all of this. >> thank you. >> thank you very much. >> woodruff: this especially cold winter is having an impact on the prices, and delivery sometimes, of natural gas and propane. in wisconsin, governor scott walker directed state agencies today to work with residents who are having trouble getting propane as supplies have dwindled as the price has spiked up. over in the northeast, as demand rises, the pipeline system for delivering natural gas is the subject of new questions. and this weekend, a rupture of a trans-canada pipeline in canada has affected customers in minnesota, north dakota and wisconsin. marty durbin is c.e.o. of america's natural gas alliance, an industry trade group. he joins us now, thank you for being here. >> happy to be here. >> so i think a lot of americans think we have this glut, this enormous supply right now of natural gas but we're finding out it's more complicated than that. >> it actually is true. we do have an he nor house