Actual election results :

246 million voters of voting age.
130 million voted.
116 million DID NOT vote.
53% voted.
47% did not vote.
64.1 million voted for Obama.
65.9 million voted for someone other than Obama.
181.9 million either did not vote for Obama or voted other than Obama.
(65.9m 116m = 181.9)
summary----
26% of voting age persons voted for Obama.
27% of voting age persons voted for other than Obama.
47% DID NOT VOTE AT ALL.
That's a total of 74% who DID NOT VOTE Obama.
so, It was not a landslide.

Dont forget the Electoral Colleges vote coming up next month.