It's unrealistic to expect candidates to have detailed policies on every issue at this stage, where the US is still many months away from an election.
Whilst copyright is an important long-term issue, there are others higher in the minds of most potential voters - whether they will get (or keep) a decent job, whether their family will be able to afford health care, whether they will be safe from people who want to harm them, how much money they'll have to give the government in taxes to pay for the above, and so on. Therefore, it's only reasonable for candidates to concentrate on the issues that are most important to the most people and fudge the less significant ones until they have had time to formulate the right policy.
It's by no means the only issue that candidates haven't expressed an opinion on - to give another example of an issue that many Linux users might be interested in, Wesley Clark hasn't really expressed an opinion on manned space exploration yet.
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