I have no insight into whether or not the Cubs players were or were not fans of President Obama, but I would speculate that a majority probably would have wanted to bail on their required appearance in the last days of the Obama presidency... but that wouldn’t have been politically correct, would it?
I have no clue as to how the players felt, but if they didn't want to be there then why did they show up? It was off season. The team can't retaliate against them otherwise the players union would be up in arms. Athletes go to these things because they want to do, or the don't go because the don't want to go. Nobody holds a gun to their head either way.