Kinder Morgan is adjusting its long-term leverage target to a more conservative range.Kinder Morgan (KMI -0.11%) pays one of the highest-yielding dividends in the S&P 500. At 6.1%, it's several times above that broad market index's average of around 1.4%. The big-time payout is on a very firm foundation, thanks to the company's steady cash flow and conservative financial profile. The natural gas pipeline giant recently showcased its commitment to maintaining a conservative financial profile by adjusting its ...