President Obama is leading presumptive GOP nominee Mitt Romney among key demographics, including women and Hispanic voters. But there’s one group that Obama -- as in 2008 -- is struggling to court: white working-class voters.

With the country’s economic recovery still lagging, will the white working class make up the same share of the electorate as it has in the past -- about 40 percent? If not, how might that play out in November? Tuesday’s Trail Mix takes a look: