Well maybe or maybe not. Biden centrist ground has built up the coalition to probably take him over the line. He has crucially appealed to some of the old lost working class democrat vote which Clinton did less well on, and that has carried him Wisconsin, Michigan and probably Pennsylvania. He has done actually a bit worse in the black and latino vote than Hilary but those votes in the swing states up north as not as quite as important.
A small point is that perhaps the Libertarian vote although small (about 1.2% nationwide) probably has picked up some more liberal minded republican vote (as in small government, non foreign intervention, balanced budgets) than democrat and that might have also helped swing it.