SPRINGFIELD — Two former state senators who sponsored and voted for bills to reduce lawmakers’ pay and forgo annual cost of living adjustments are now asking the Illinois Supreme Court to declare those measures unconstitutional and award them their back pay.Former Sens. Michael Noland, D-Elgin, and James Clayborne, D-Belleville, have been successful so far in their legal efforts, prevailing in 2019 in Cook County Circuit Court before Judge Franklin U. Valderrama. But Illinois Comptroller Susana A. Mendoza, the …