This article made their analyses very credible by citing numerous statistics regularly throughout the piece about how the bill would hurt students, women, and minority groups by doubling federal student loan rates.
The article also placed it in context of the election by comparing the bill's impact to a growing trend of GOP legislation that negatively impacts these groups disproportionately. They also provided very good temporal context of the growing issues surrounding post-high school education costs, and the implications for voters.
By drawing in ample evidence surrounding these areas, the article had an implicit argument that the GOP candidates and legislature representatives are, indeed, attacking these minorities particularly. The statistics make the argument for them, which prevents the article from sounding so political it would need to be in the opinion section.