Joe Lieberman would never have been re-elected — a strong proponent of the war — against an opponent who was for pullout, if that was the American people's attitude.
TPM Election Central's Eric Kleefeld neatly rips this absurd argument to shreds (click through to read the whole thing and see the video of McCain making the claim):
First, let's take a look at Connecticut's exit polls. They show that sending more troops had the support of — get this — 15% of voters! Meanwhile, 63% of voters said some or even all troops should be withdrawn, in complete opposition to Lieberman's real position.
Second, given the total number of people who cast their vote for Lieberman, it's nothing short of absurd to say that it's in any way indicative of anything national. According to the final results, a total of 563,725 people voted for Lieberman — in other words, just over half a million in a nation of 300 million people.
Finally, Lieberman won because he was able to misrepresent his views on Iraq, not because voters agreed with his actual views on the subject. Back in July, Lieberman actually said he thought we'd be able to draw down "significant" numbers of troops by now. What's more, Lieberman worked hard to blur the line between himself and Ned Lamont on the Iraq issue. In one ad, for instance, he spoke of wanting to "bring our troops home from Iraq."
What he said.