"Look at the historical numbers when the loser got 43% of the vote."
Alway glad to provide some data. Here are the Presidential elections sorted (in acending order) by the "Popular Vote" percentage of the major party losing candidate.
Hope this helps,
dvwjr /nobr
Dukakis had 45 and came in about where McCain did; Mondale was blown out at 40% as was Dole, Carter, Stevenson, Humphrey, then Stevenson lost another landslide at 44% as did Wilkie.
Translation (or at least what I make of these numbers): someone at 43% doesnt stand a hope in hell of suddenly attracting 8% of the vote, while the other guy stands a really good chance of getting close to 55-56%, which is, indeed, a landslide.