at national, i can lose the wait...and keep it off. looking good, patrick. i know. (vo) go national. go like a pro. ♪ >> martha: several 2020 democrats today at a climate change forum that is taking place at georgetown university, instead of in new york, it's in d.c., hosted by msnbc today and tomorrow. a dozen candidates taking the stage over the course of the next couple days, as i said. they are pitching to save the planet. here's a little sampling. >> if you are the president of the united states, will you lead by example and order an electric presidential vehicle? >> yes they will, and i will go