A judge who dutifully makes decisions strictly based on their interpretation of the constitution would still be seen in a partisan light, because different methods of interpretation are championed by different political philosophies. Conservatives support originalism, the theory that the constitution's meaning is based entirely on what it meant when written, and liberals favor the living constitution, a theory that the constitution's meaning changes (for example, 'all men are created equal' didn't apply to women at the time, but given our current societal standard, it does now, even in the absence of any amendment to that effect). There's nothing wrong or improper about having either philosophy of interpretation, or another one, as long as the judge is consistent.
Now, a number of current members of the supreme court claim to fall in one or the other category, but in practice they vote their political allegiance. In Ledbetter v. Goodyear, where Goodyear was sued for giving discriminatory pay based on gender, the conservative majority ruled that the Civil Rights Act, which stated a statute of limitations of 180 days to file suit after a discriminatory act was committed, applied only to the initial discriminatory paycheck, not the ones that followed suit (it took Ledbetter years to know she was being paid barely half what her male coworkers were making, less even than workers doing the same job with years less experience). Congress, in enacting the Civil Rights Act, clearly meant to enact broad, not narrow, protections, so the originalist majority willfully misinterpreted the intent of the writers of the law; those jurists are pro-business, it seems, more than they are anti-hypocracy.
All that said, and sorry for being so long-winded, the problem is with the individuals, not the institution. All you need to get a good jurist is a president with a commitment to fairness, an honest and qualified judge, and a supportive congress! No problem, right?
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Side note: Idunie, do you think Obama oversaturation is a good reason to vote one way or the other, or are you just pointing it out?