How well will Mittens do with the white working class if he wins the nomination?

[memphis]

You'll have to define "working class" for this thread to be meaningful. The GOP usually wins among lower income whites, albeit more narrowly than with wealthier whites. Anywhere from 50-55% sounds reasonable.

[memphis]

I do think that Romney might underperform with this demographic (though he might overperform with higher-income whites). Neither Obama  nor Romney is exactly the dream candidate for appealing to the white working class, though.

Didn't Obama win amongst higher income whites in 2008 and the same for Kerry in 2004(very narrowly)? Although, from what I remember the Republicans did rather well amongst this group in 2010.

Absolutely not. High income whites are one of the most solidly GOP groups in the nation.