It doesn't matter. The polling was about peoples approval vs. how they voted for him, but it didn't eliminate those who didn't vote.
32.65% of the registered voters voted for Obama. 67.35% didn't. If 52.92% those who didn't vote for him split, like him to start with, polled, he is at a loss of 26.46% of those who didn't vote for him.
Registered voters: 212,720,027
69,456,897 votes for Obama, 32.65% of registered voters
112,564,176 votes assuming 100% of registered voted
100,155,851 votes not for Obama
+52,999,057 difference between 100% vote to the 61.7% voter turnout.
-38,977,238 14% of those not voting for Obama
14,021,819, which represents a 26.46% loss of those who didn't vote for Obama.