I’m going with Obama. He didn’t even bother to sit down with the Republicans, and even if they were partially to blame, he still disproportionately blamed them for every problem they had, even those of his own making.
LOL. Republicans really do live in their own little world. The Republicans got 95% of what they wanted in every bipartisan deal under Obama EXCEPT the one time Patty Murray led negotiations (which were on the budget -- she actually got a very favorable deal for Democrats, which just goes to show it wasn't inevitable that Democrats give away the barn to Republicans every other time.)
Also, Obama has been exceptionally NOT active in partisan politics, which you would realize if you were old enough to remember more than W and Obama. The only reason W was even less active was because no one wanted to be seen with him.
The problem with Republicans isn't that they live in their own little world - it's that they insist everyone else live there , too.