Campbell's Chairman Retires in November  LOS ANGELES (Reuters) - Campbell Soup Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CPB.N target=/stocks/quickinfo/fullquote"&gt;CPB.N&lt;/A&gt;, the  world's biggest soupmaker, on Thursday said its chairman,  George Sherman, will retire in November.