http://caselaw.findlaw.com/court/us-supreme-court this website also works. It has lots of cases and supremecourt opinions. It also give you the feeling of being a lawyer.
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1.) The role of the supremecourt is to protect human rights ... human rights.
Therefore, the supremecourt has to use stuff in ... 2:
1.) If the supremecourt isn't bound by the ... the constitution can justify a court decision.
I download an app called "Tuneln Radio," where you can listen to a lot of supremecourt debates there. I think listening to those debates can also help you improve your sense of argument.