Opposition to nuclear power is based on scientific and engineering beliefs that may or may not be completely correct. Personally, I agree with some of the environmentalist's objections and I believe they are valid, but I don't believe they represent insurmountable problems and that the debate should be reopened because of the many benefits of nuclear power.

The opposition to stem cell research is based on religious and moral beliefs which are neither correct nor incorrect. They are beliefs. Personally, I don't agree with any of them and I feel
they are invalid. But my opinion is irrelevant, what matters is the government should not support these religiuous doctrines by modifying its policy to accomodate their proponents.

The first is a valid subject for political discussion and debate, and scientists should be consulted as expert witnesses. The latter is a bone thrown to religious fundamentalists to lock in their support of conservative candidates. If you really believe these two issues are comparable you are very mistaken.