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The best case for GOP presidential candidate John McCain's maverick status could be made by pointing to his stands on two traditional hot-button scientific issues: stem cells and global warming.

Like his Democratic rival, Barack Obama, McCain favors expanding federal support for embryonic stem cell research, and for years he's been proposing potentially painful programs to cut greenhouse-gas emissions.

"Their emphases are different, but when you come down to it, their policies are very similar, on paper," said Kei Koizumi, director of the R&D Budget and Policy Program at the American Association for the Advancement of Science.

That's one reason why science-related issues haven't had much visibility during this year's campaign. A bigger reason is that there are more immediate matters to worry about, ranging from the continuing financial crisis to the wars in Iraq and Afghanistan. When the markets are crashing, does it really matter what the candidates say about research spending or future innovations?

Shawn Otto, chief executive officer for ScienceDebate 2008, argues that it does. He points out that scientific and technological advancements...