According to Bush/Cheney, John Kerry advocates wholesale violence against pregnant women, refusing to vote for a measure that "protects" them.
The real story: The Laci Peterson law increases federal penalties for the murder of pregnant women, including allowing suspects to be charged with two murders. This bill became a bandstand issue when Republicans insisted on using the phrase "unborn child" and shot down a Democratic amendment to revert to the phrase "fetus".
Although Bush/Cheney claim bipartisan support for the bill, only 35 Democrats and 2 Republicans voted against it., primarily because of the phrasing issue.
SFGate.com: Bush ad bashes Kerry over Peterson law