Supply, silly. Abortion increases breast-cancer risk by 40 percent, and Komen's officers and staff need jobs. More abortion > more breast cancer. No breast cancer, no Komen.
I think I'm exaggerating, but I may be wrong. In any case, both causes have a large middle-aged divorcée following, so there's likely to be a large overlap among the supporters.
OMG!!! I never thought of that....I think you have something there.