General election polls this far out with several candidates are meaningless. They become more telling as the field winnows to the nominee and they start focusing on each other. Reagan was way behind Carter coming out of the convention which are still months away.
Reagan-Carter was a totally different situation. Afte those mid year polls that showed Carter ahead by 15, Carter was beset with the Iran hostage issue and a tanking economy. As someone running for “Obama’s third term,” Hillary faces no such approval-dragging factors.