Back in 2004, Democrats thought and Republicans feared that stem-cell research was an increasingly powerful issue that would work in favor of the former. The Democrats had Ron Reagan Jr. deliver a prime-time speech at their Boston convention. “Millions are afflicted. . . . Now, we may be able to put an end to this suffering. We only need to try.” Nothing like that this time around. Always overrated as a political issue, stem-cell research is becoming less of one.