To do on your own: Open both sources and skim them for just a couple of minutes - you won't be able to really read them, but try to get an idea of what kind of source you're looking at. Use Google if you need to to help you find out more about the source. Notice the structure of the article and any characteristics of the source that you think are important.
Then, talk about the following with a buddy or in a group of three (be ready to discuss with the larger group):
What type of source is each of these sources? How do you know?
What evidence did the authors use to create their sources?
Would you use this source if your paper were about Obergefell V. Hodges? Why or why not?
What other types of sources might you need to find for a paper on this topic?