you know, with his mother-in-law being there. >> but you are a part of something greater. he wasn't just a blackman. he's one of the most intelligent men who has hit that white house, black or white. >> for more on president obama's legacy, let's bring in presidential historian at american university, alan lichtman. what will be taken away from what will be president obama's legacy. obamacare is one of those. president obama reflecting on that today on abc saying, yeah, it is very possible, theoretically, that 20 million individuals could not have health insurance. but that may include some trump voters. do you see this being undone? >> i think it should be very difficult for the republicans to undo a lot of the obama legacy. just, for example, in foreign affairs. trump said he is going to tear up the iran nuclear agreement. that's not going to happen.