Let's be realistic here, if the polls are even close to right, he is going to win and by a good amount.

However, the president have very little power to actually do anything. He can't make laws etc. He can only ask for them, then veto them.

With Obama in the office, if you accept that premise, focus your time on senate and the house. An Obama presidency with or without house/senate rubber stamp is very different. Fight for the senate/house seats and limit the damage.