Palin is trying her best to signify herself as "working class." She just referred to "people on Mainstreet like me," "East Coast politicians," etc. Like Nixon, but with lipstick.
People on Main Street don't have mansions with tanning beds. I'm sorry, none of the people running for president are "working class" or "Main Street"; they are incredibly privileged. I'm getting really tired of these really insincere appeals to working-class and middle-class people.
Still there's a qualitative difference between saying you grew up "working class" and portraying yourself as being that way now.