Well .. not in the short term.

Stem Cell Advance

More than ever, it appears that the promise of such pluripotent cells can be explored—all the way from basic science to the clinic—without the need to use or destroy human embryos, and so without political or ethical controversy.

Excellent news. Now partisan Republicans can clear McCain's support for stem cell research from the record almost entirely because soon the debate regarding ESCR will end on the note that embryos aren't even necessary.

Just remember McCain doesn't become more ideal just because this issue looks like it will become functionally irrelevant. Fact is, he still supported it.