EASY CHOICE — Dickie Cannatelli, 72, voted in favor of a casino during a referendum held in Everett on Saturday. By a landslide vote of 5,320 to 833 — 86.5 percent to 13.5 percent — Everett voters endorsed a $1.2 billion gambling resort proposal from Las Vegas developer Steve Wynn, who wants to build on vacant industrial land on the Mystic River waterfront. The vote was the first binding referendum under the 2011 state law that legalized casino gambling in Massachusetts. No project can compete for a coveted casino license unless the voters of the host community approve the proposal at the ballot box. About 32 percent of the city’s 19,400 voters turned out for the unusual Saturday referendum, according to the city clerk’s office.