Polls open in Kazakhstan for a referendum to overhaul the constitution after deadly unrest in January ended founding leader Nursultan Nazarbayev's three-decade grip on power in Central Asia's richest country. The drive for a "New Kazakhstan" in the wake of the violence has come from the man that Nazarbayev hand-picked to replace him as president in 2019, Kassym-Jomart Tokayev. Tokayev, 69, describes the snap referendum as a shift from "super-presidential" rule that will strengthen parliament. IMAGES