Broad base can support extension of S&P 500 rally

By Rodrigo Campos NEW YORK (Reuters) - The seven-week U.S. stock market rally still has some room to run and could punch through the record high set by the S&P 500 last May, based on a number of indicators that are pointing the way higher. Furthermore, worries have eased about some threats to the bulls' case for stocks, such as an aggressive U.S. monetary policy and spreading weakness from China and other developing markets.