Washington, DC (LifeNews.com) -- Joe Biden, Barack Obama's pro-abortion running mate, is coming under fire for comments he made today attacking vice-presidential candidate Sarah Palin. After attacking her on abortion, Biden then slammed Palin on the birth of her son, who has Down syndrome. During her acceptance speech last week, Palin promised the parents of disabled children that she would be their advocate in the White House. Biden questioned that commitment by attacking Palin's stance on the issue of embryonic stem cell research, which has never helped a single patient. "I hear all this talk about how the Republicans are...