text: New York AG to Sue Insurance Broker  NEW YORK (Reuters) - New York Attorney General Eliot  Spitzer on Thursday sued insurance broker Marsh   McLennan Cos.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MMC.N target=/stocks/quickinfo/fullquote"&gt;MMC.N&lt;/A&gt;, charging they engaged in market manipulation.