PORTLAND, Maine — Embattled US Senate hopeful Graham Platner on Sunday swiped a page from New York City fellow lefties Zohran Mamdani and Alexandria Ocasio-Cortez to rant about how billionaires shouldn’t even exist. The Democratic leading candidate jokingly added to the jam-packed crowd at a local Elks Club that the country’s 1 percenters should even be jailed if they try to bankroll campaigns. “If I had my way, elections would last two months, they would be publicly funded, and if a