The explanation that I got from Jenkins office as to why she voted against this amendment is because it is unconstitutional, since it specifically singled out Planned Parenthood. The nice young woman on the phone said that Jenkins does not support federal funding for abortions but also does not support targeting specific organizations with Congressional legislation and did not want to start that precedent.
The staffer also said that the Pelosi/Waxman/Obama healthcare reform bill is a nightmare and that it is designed to push everyone into a government run plan that rations care.