@nimh,
I 'm not curious enough to investigate, but I suspect there's more disapproval of Obama out there than is indicated in these polls. Indeed he factors behind it may well be related to those behind the rather pervasive wide disparity observable between the preelection Presidential polls and the voting results in nearly every state.
If I'm not mistaken Trump carried about 40 of our 50 states.
The very wide Republican majority in the House of Representatives where all of 435 seats were contested and in the Senate where about 33 seats were contested reveals a very decisive (and large by historical standards) popular majority for the Republicans. I suspect many voters were a bit spooked by Trump's brash manner and tactics, and that may explain why he trailed his party. However the results of both the preelection polls and the election itself indicate that trump's support was growing during the last few months before the election, and is very likely much stronger now.
I agree that Hillary proved to be a very weak candidate. Indeed I'm truly surprised she survived her several fiascos during her term at the State department. A very politicized and partisam President and Justice Department (not to mention DNC) saved her for a defeat she amply earned.