This beaten-down pot stock may have a lot of upside only if the U.S. marijuana market opens up for business.Thus far, 2024 has been an exceptional year for Aurora Cannabis (ACB) stock. Up more than 40%, it's been generating some impressive returns for investors. And recent developments involving rescheduling marijuana in the U.S. has gotten investors even more bullish about the stock and its long-term prospects.Could the Biden Administration's latest move, to reclassify marijuana as a Schedule III substance ...