John Judis is a smart guy, but I think he goes partly wrong in his description of left and right working-class populism - at least when in the context of 2010 politics. Judis describes left populism as resentment of speculators. Fair enough maybe, but his description of right-wing working class populism as targeting primarily "out-groups" who are "seen as trying to deprive workers of their jobs and earning." falls short as a description of conservative working-class populism at the moment.
On the drive home, I sometimes listen to Howie Carr. He is kinda the voice of conservative working-class populism in Eastern Massachusetts. There are alot of digs against illegal immigrants, but not all, or even most of this populist resentment is directed downwards at "out" groups. At least as much hostility is directed at Washington politicians, public employee unions, ideologically biased journalists at prestige outlets like the New York Times and the major broadcast networks, and businesses that stand to benefit from cap and trade. The greatest targets of criticism are upper middle-class liberals - or as Carr constantly calls them, "the beautiful people". They are portrayed as eager to remake society to their liking, but confident in their ability to escape whatever negative consequences their plans produce.
There is alot to criticize in Carr's worldview, but he has found an audience. The expansion of government has created an expanded governing class and ever more client and allied groups - many of them much more connected to power than your average working-class voter. And they too are targets of current populist conservative resentment.