State Treasurer Walker Stapleton and PERA Executive Director Greg Smith disagree about how serious the disappointing 1.5 percent return on retirement investments the Public Employees’ Retirement Association fund for 2015 will be in meeting future pension obligations. ... State Treasurer Walker Stapleton said Tuesday’s announcement from the Public Employees’ Retirement Association is evidence of a mishandling by the board, in line with concerns he has raised for several years. ... Stapleton is outraged. For several years, the Republican has shouted for more conservative assumptions. He worries about long-term stability under a high projected rate of return. “PERA has assumed the...