Obama inviting Warren to speak at the inaugural is brilliant but only in the relative sense, ie, it's not really brilliant per se, but it just seems brilliant in comparison to most other politicians that are so mind numbingly stupid.
Bush lost the popular vote in 2000 and barely won it in 2004 and yet he had his middle finger stuck up to his political opponents for eight straight years. Then Obama won by a big margin and the first thing he did was invite one of the leaders of a wing that most strongly dislikes him. Isn't that just the common sense smart thing to do? In fact, I think one reason Obama won so big in the first place is that such common sense smart things like that are his normal operating procedure.
The people having reflexively terribly negative reactions to Obama inviting Warren are being shortsighted at best and blindly dogmatic at worst. IMO the biggest enemy of all is dogma and one of the reasons I like Obama so much is that he seems very pragmatic and anti-dogma.