I mean, it should be an issue. But we are a nation of dumbs, unfortunately.
Yes I'm sure Abraham Lincoln and Harry Truman were absolutely unfit to be President, unlike such eminently qualified college educated men such as James Buchanan and Herbert Hoover.
Trying to attack him for this will backfire, because it will make the attacker seem like an elitist snob.
This.
As much as I deplore Scott Walker's political stances and actions, attacking him for the lack of a college degree is both idiotic and counterproductive. It will only further fuel the Culture War narrative and alienate the white working-class vote, when instead the Democratic Party should be gunning for this vote by advancing the sort of economic populist agenda outlined in a modest way in President Obama's latest State of the Union.
Of all the things to attack Walker on, his education (or perceived lack of one) is one of the worst things Democrats could do. There's a huge number of people who never finished college that would be quite turned off by attacks like these.