The new Quinnipiac University and ABC/Washington Post national surveys out this week converge on one key conclusion: as the election nears, President Obama is sinking to historic lows among the group most consistently hostile to him.

Throughout his career on the national stage, Obama has struggled among white men without a college education. But in these latest surveys, he has fallen to a level of support among them lower than any Democratic nominee has attracted in any election since 1980, according to an upcoming National Journal analysis of exit polls from presidential elections.

Though pollsters at each organization caution that the margins of error are substantial when looking at subgroups such as this, each poll shows erosion within that margin of error for Obama with these working-class white men. The new Quinnipiac poll shows Obama attracting just 29 percent of non-college white men, down from 32 percent in their most recent national survey in April, according to figures provided by Douglas Schwartz, April Radocchio and Ralph Hansen of Quinnipiac. The ABC/Washington Post survey found Obama drawing just 28 percent of non-college white men, down from 34 percent in their May survey, according to figures provided by ABC Pollster Gary Langer. Romney drew 56 percent of the non-college white men in Quinnipiac and 65 percent in the ABC/Washington Post survey.

No one expects Obama to win these blue-collar men, who are now among the most reliably Republican segments of the electorate. But even so, these numbers, if sustained through Election Day, would represent a modern nadir for Democrats. Since 1980, the worst performance for any Democratic nominee among these working-class white men was the 31 percent Walter Mondale managed against Ronald Reagan in 1984; the meager 39 percent Obama drew in 2008 was actually the party’s best showing over that period. These new surveys show Obama that these non-college white men represent Obama’s largest source of decline in the white electorate since 2008.

Still, Obama is also facing weak numbers among working-class white women. The Quinnipiac Poll shows him drawing just 37 percent of white women without a college education, and the ABC/Post poll puts him at 40 percent with those women. {snip}

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By now, the reasons for Obama’s struggles with working-class whites are familiar. Many are culturally-conservative; more are deeply skeptical of government (including his health care plan); and most are struggling in the sustained economic downturn. Polls also consistently show many working-class whites are deeply uneasy about the propulsive racial and ethnic changes that Obama uniquely embodies.

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