A new Allstate/National Journal Heartland Monitor Poll details President Obama's slippage with various voting groups -- particularly white voters.

"Overall, Obama has slipped from 52.8% of the vote in 2008 to 44% approval in the new survey with 49% disapproving," writes Ronald Brownstein of National Journal.

Brownstein also says that "Obama has declined not only in the groups that were always dubious of him, but also with several that enthusiastically joined his winning 2008 majority."

That includes college educated women who backed Obama over John McCain in 2008. In fact, Brownstein writes, "Obama is now facing dismal approval ratings in all corners of the white community."

Brownstein's analysis: