Plains All American Pipeline (PAA) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this oil and gas transportation and storage company have returned +6%, compared to the Zacks S&P 500 composite's +5.2% change. During this period, the Zacks Oil and Gas - Production Pipeline - MLB industry, which Plains All American falls in, has gained 5.2%. The key ...