I always felt like Obama 2012 campaign was way more impressive to me than his first.
In 2008 Obama had the wind at his back and everything was going in his direction by the time most Americans voted on election day. Im not saying that it was not an amazing victory but I truly believe any Dem could have won that year.
Now 2012 is different and I think that any other Dem besides Obama would have lost that election. in 2012 Americans had at that point spent years dealing with a painfully slow recovery.
obama was now facing Americans who where understandably upset at the pace of the recovery and he was also dealing with a Republican party who was wiling to do whatever it took to get him out of there.
After all Mitch McConnell famously said this 2 years before the election
https://www.youtube.com/watch?v=2gM-1HbK4qUThey even tried to blame him for the overall recession and pretended that it started under him instead of bush yet despite all of that and 1 poor first debate by Obama
He defied all the laws of political gravity by being the first president since FDR to get reelected when unemployment was over 7.7 percent. Biden campaign is so far stronger than Hillary's but I don't think think it tops 2012.