The Super Bowl was a week and a half after the inauguration. It just so happened that there were two republican senators from one team's state and two democratic senators from the other team's state -- so Obama invited all four senators to watch the game with him. To anyone who wanted to work together for the good of the country, this was a golden opportunity. Three plus hours with the new president in an informal setting. Plenty of time to get to know something about him, to present one's ideas and maybe make some deals.
You know how this story has to end: both republican senators turned the invitation down.
This set the pattern for the next four years. Time and again Obama adopted republican, conservative ideas -- only to have republicans immediately turn away from their own ideas, their own initiatives for the sole purpose of saying, in this election season, that Obama failed to get the bipartisanship he hoped for.
Do you want to reward this kind of behavior? Because if the Republicans win this election, it will validate their strategy and the next time they are in the opposition they will do exactly the same thing.