If the article mentions that "Senator X of the pro-life camp said ..." you answer the quiz question with "X" (because it's an indisputable fact that the article calls X pro-life) and then you are free to comment how "pro-life" is a biased term, or that X is a shill for Y who supported murdering babies in the past, or whatever.
You don't have to agree with the article's stance to know how to answer the questions, you just have to know what the article's stance is.
If you didn't read the part but skimmed over it, you might be motivated to leave a comment to mention the AP stylebook's recommendation, to the benefit of other commenters.
As far as I can tell from briefly viewing them, the MSNBC and Fox News web sites don't allow comments.
From the source, it seems they're using Adobe Livefyre.