New York is a closed primary state which means independents cannot vote for any Democrat on ballot. Independents have swayed largely towards Bernie which means Clinton has structural advantage in New York, not to mention it's her home state and its two term Senator. But, it's no longer a sure thing for Clinton.

"And more importantly, it’s Donald Trump’s turf, too. If Hillary thinks wagging her finger at an innocent young Greenpeace activist is rough, wait until she hears the taunts from Trump for losing their beloved home state. Especially if the blustery billionaire wins the GOP side of the ballot. Talk about bragging rights." - Boston Herald

A Heart In New York - Simon & Garfunkel