UPDATE: Morgan Keegan Lowers PT on MarkWest Energy Partners to $56

Morgan Keegan is out with its report today on MarkWest Energy Partners

, lowering its PT from $57 to $56. In a note to clients, Morgan Keegan writes, "We are raising our targeted yield range by 25bps to 5.25%- 5.75% due to general macro concerns over sovereign debt which has the effect of lowering our 12-month price target by $1 to $56. We estimate MWE's 12-mo total return potential as 18%-28%. Maintain Outperform." At the time of posting, shares of MWE were trading at $48.28, down 0.12% from Tuesday's close.