ComRes and ITV have a damning pre-speech poll for Ed Miliband. Of those who expressed a preference 78% think Miliband does not come across as an election winner and 72% say Labour would have a better chance without him as party leader. Balls doesn’t fare much better. Of those who expressed a preference 57% think he should be replaced as Shadow Chancellor. Just the confidence booster Miliband needs before his big speech…