Once carried like a conquering hero, President Obama is now pleading with donors for help to push his agenda, having to convince them that his record is something that should wow them. "Do you still have my back?" Obama asks in a new letter to donors and contributors. "You should be proud of what we have been able to accomplish together," he argues. "Can I count on you?" The president's note is to those who supported him in the past. "I would not be here today without you. You have been an essential partner in everything we have accomplished." The...