global warming. in one of the most beautiful places on earth, mike and kelly run a glacier touring business. but those glaciers are shrinking. we just really, really watched the glaciers change, and dramatic changes. reporter: scientists say this year alone, the average glacier will lose 30 inches in thickness. there are about 20,000 glaciers in alaska, and almost all of them are retreating, losing mass and shrinking. reporter: and that s why president obama is making alaska the last leg of a 14,000-mile trip, focusing on climate change in advance of a critical international meeting in paris in december. a white house video pre views his unprecedented visit to the alaskan arctic. here in blackstone bay, we found ourselves in the middle of a pod of orca whales. it s absolutely incredible. but even in this remote, majestic place, you re never far
showing clinton and sanders down 17 points. this isn t anti-hillary clinton. this is pro-bernie sanders and saying enough is enough. vice president biden showed up unannounced at a weekend in delaware that his son beau would often attend. people said they would vote for biden even though for now he s not a candidate. in numbers, trump is on top again. in second place, ben carson, and not far behind, ted cruz and scott walker, who said it was fair to consider a wall not only in mexico but in canada, too. this is a legitimate issue for us to look at. this morning we re hearing from former vice president dick cheney who said of hillary clint clinton s mishandling of her e-mails that it was, quote, sloppy, and as far as seeing joe biden run for president, he said, quote, i would love to see joe get in the race. time now to bring in our news nation political panel today. msnbc political analyst and washington bureau chief david cohen. joining me in the studio, both of