We all know this wouldn't happen. Huckabee said he'd campaign "vigorously" for McCain, and while he won't rule out running again for Republican nominee in 2012, he won't do it if McCain is elected this year and decides to go for a second term... Huckabee knows he'd be throwing away his chances in 2012 if he does any third party/independent boat-rocking now. Fred Thompson is mates with McCain.
Aside from the fact it wouldn't happen, it's an interesting thought...
Democrats have learnt their lesson and don't vote for Nader.
In the north-east, the moderate Bloomberg takes away some of the independent and moderate republican support that McCain was relying on. Expecting a big win, Democrat turnout in NY for Clinton is very large. Bloomberg takes more votes than McCain in NY, but no one expects him to win, so turnout is still low.
Through Michigan, Ohio, Penn and WV, Clinton does well with unionised workers. polling throughout the country has revealed a splintering of the conservative vote between McCain and Huckabee and no one expects Clinton to lose. Republicans in these states are hurt by low voter turnout, while Democrats are enthused - leading to comfortable swings to Clinton.
Huckabee carries his home state of Arkansas, and additionally Miss, Alabama and Georgia. He splits the conservative vote in SC, Florida, VA, NC, Tenn, Kentucky, TX and LA, resulting in the Dems picking up those states.
The conservative vote splinters further in Utah, with a very close contest. The Dem vote, united, just wins against Huckabee (2nd) and McCain (3rd). Idaho, Montana, the Dakotas just go to the Democrats for the same reason.