No one before ever had a core constituency like 0bama. Think about those that refused to believe OJ was guilty, and even if he was "so what?".
Some people at FR are afraid of their own shadow. No election has gone the Democrats way in a red or purple state since 2008. Polling is terrible for him and the Democrats. There is always a constituency for the far left, but it is not a majority. There are always leftist, government dependents and special interests to make a lot of noise publicly no matter how bad there side is. The Democrats and Obama have lost the suburban votes that put them in office...the ones that rejected the GOP in 2006 and 2008. Unless there is a massive economic improvement in the next 12 months, they simply cannot win.