Obama v McCain - Obama leads

Obama's lead grows, and this is before Republicans and non-affiliated voters have really seriously looked at Obama.  This is the problem with Hilary v Obama v McCain matchups -- Hillary is doing as well as she'll ever do, and Obama still has upside.  The higher percentage of Republicans, nonj-affiliated and young people turning out for Obama, consistently in the primaries is something she just cannot bring, and she cannot win in November with just Democrats.