Stocks Near Flat; J J Pressures Dow  NEW YORK (Reuters) - U.S. stocks were little changed on  Tuesday, with oil prices dropping below \$42 a barrel helping to  support markets, but Johnson   Johnson &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JNJ.N target=/stocks/quickinfo/fullquote"&gt;JNJ.N&lt;/A&gt; put pressure on  the Dow following a report of a possible \$24 billion takeover  of cardiovascular device maker Guidant Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GDT.N target=/stocks/quickinfo/fullquote"&gt;GDT.N&lt;/A&gt;.