PM Images MPLX LP (NYSE:MPLX) has been one of the midstream operators I was bullish on for some time. In March, I turned neutral as I believed the valuation was getting a bit stretched, but I am turning bullish on MPLX once again. The barriers to entry are immense within the energy infrastructure sector, and MPLX has developed a system that is difficult to replicate, as it's designed to move millions of barrels of crude and refined products through its pipelines each day. MPLX returned nearly $1 billion ...