The Democrats are the experts at this cynical practice.
Leaving aside the crass exploitation of this issue for political purposes, thers this consideration.
"But it’s strange that Fox has so eagerly bought the promises of the stem cell research community. If Fox thinks that stem cell research offers him (or me) hope, he’s mistaken. Stem cell research, both embryonic and otherwise, right now represents nothing more than a promising theory. If it bears fruit, and that’s a huge “if”, it will likely do so too late to benefit Fox, me, and our contemporaries. In spite of the silky rhetoric of John Edwards-type politicians, dramatic medical innovations come slowly and take decades to pan out, not months."
But, as we are all too well aware, "it's all Bush's/the Republicans' fault".