* US stocks end lower; Tesla a drag * Deepening French political crisis weighs on euro * Gold extends rally; futures go above $4,000/oz (Updates with US closing levels) By Caroline Valetkevitch NEW YORK, Oct 7 (Reuters) – Major stock indexes fell on Tuesday, with the S&P 500 ending lower after recent record highs, and investors eyeing political upheaval in France, Japan and a U.S. government shutdown, while gold futures hit $4,000 an ounce for the first time. Demand for safe-haven gold has been driven in part by uncertainty over the U.S. government shutdown as well as expectations for another U.S. interest rate cut. U.S. gold futures for December delivery settled at $4,004.4, up 0.7%. The shutdown is now in its seventh day. The euro fell against the U.S. dollar for a second day as investor

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