I see Palin doing very well in the Deep South, I don't really think landslides are possible in today's environment. And it's hard to see Palin getting only 40% of the vote remember McCain/Palin got 46% even with Bush's approval rating in the teens and with her being completely unqualified for the office. I see more like 55-45 win for Clinton.
America is polarized enough that a 60-40 landslide is practically impossible. People excuse spectacular incompetence so long as the politician tells them what they want to believe.
That said, Sarah Palin (1) really has no chance, and (2) showed beyond any doubt that she could not communicate with people whose first language isn't English. She did about as badly as other Republicans in states in which such people are rare, but she did horribly among Hispanics and Asians. She projected to lose Texas to Barack Obama if she were the GOP nominee in 2012.
The map showed what I thought a 60-40 split looked like for a Democratic nominee for President. To get such a landslide a Democratic nominee would have to max out in the Northeast, the Great Lakes, and the West Coast (like Obama in 2008) while breaking even in other states. I didn't say that such was likely. 55-45 is about as strong a landslide as I can see anyone imaginably getting.