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Birth state of pennsylvania blue. in fact, he's picked philadelphia has home base for his campaign. political reporter arlette stein is joining us now. how did biden's message of unity land there? >> reporter: well, ana, you heard joe biden stressing the country needs to come together and unite, but he was also hammering away at one other point, saying that they must defeat president trump. he talked about certain issues important to voters, like civil liberties, a woman's right to choose, climate change, and the priority in his plan for climate change, he says, is defeating the president. i w...

Media. >> i think the thing that matters most to the president is he be affirmed by the people who love him, the people on twitter who follow him and respond every time he says something. he uses twitter almost as a personal polling service. >> reporter: the president has often relied on twitter to share his grievances and announce major decisions, but those who study him say more and more, he seems to be using twitter to gauge the reaction of his base over the advice of his administration. a far cry, historians say, from presidents who relied on polling, intelligence briefings, and background...

Eventually. that good front running. let's hope it's not 12 years like tiger's front running lasted. >> reporter: so far, koepka continuing to dominate here in round three. before i go, ana, i want to show you a funny moment from round two yesterday. dustin johnson was getting ready to take a shot in the fairway, and the camera, they caught his playing partner, running off to find a tree to use the bathroom, and the camera guy saw what was happening and tried to frame him out, but didn't quite work. i guess, you know what they say, you got to go, you got to go. >> you're supposed to go behind ...