@Brandon9000,
You have a real problem acknowledging the flaw in your argument--which must be partisan pig-headedness, because i know you're not stupid. Whether or not the
less than 46% of the electorate who voted for McCain are representative of the rest of the population, that does not alter that you simply cannot know who is or is not "happy" about Obama's inauguration. Your thesis is predicated upon an assumption that McCain's failure will make all those who voted for him unhappy--and you can't know that. As Habibi and others have pointed out, and as Phoenix represents an example, plenty of voters who chose McCain can reasonably still be happy that Obama was elected, or at the least, not unhappy.
As for the representative nature of McCain's electorate, exit polls consistently show that those
least likely to vote are young people--a group in which Obama scored significantly higher than did McCain. Obama beat McCain in every age group below the age of 65.