MILWAUKEE (AP) – Gov. Scott Walker is expected to sign a new law weakening the powers of the Milwaukee County Board.  The bill increases the power of the Milwaukee County executive, reduces the terms of county supervisors from four to two years and requires a binding referendum next year on cutting supervisor salaries from about $51,000 to $24,000.  Democrats have said the bill was an attack on local governments’ power to control themselves. They also complained that Republicans should not be telling local governments how to operate.  Republican lawmakers have said the Milwaukee County Board is their only target and that the measure reins in what they described as an uncontrollable board unwilling to make necessary reforms.  The governor is signing the bill Friday afternoon in Milwaukee.