>In a recent analysis, we found that 53 million workers ages 18 to 64—or 44% of all workers—earn barely enough to live on.

>The majority of low-wage workers (77%) have less than a college degree,

So there are 53 (1-0.77) = 12.2 million workers with college degrees who are only able to earn "barely enough to live on".

Poor instruction or irrelevant majors in college? Or drug use, criminal convictions, disabling disease or injury after college? Long term career success has a lot to do with parents, friends, spouses, and children as well as a large helping of luck.