Welcome to From the Politics Desk , a daily newsletter that brings you the NBC News Politics team’s latest reporting and analysis from the White House, Capitol Hill and the campaign trail. In today’s edition, Sahil Kapur talks to Maine Democratic Senate candidate Graham Platner about he sees himself as an heir to Bernie Sanders’ legacy. Plus, Andrea Mitchell breaks down the on-again, off-again negotiations with Iran. Sign up to receive this newsletter in your inbox every weekday here. — Adam Wollner Graham Platner lays out what kind of senator he would be By Sahil Kapur YORK, Maine — Graham Platner says he will push Democrats to rethink their vision of power and pursue an aggressive agenda if he’s elected the next U.S. senator from Maine. In a recent interview, Platner called for replacing Senate Minority Leader Chuck Schumer, D-N.Y.; organizing an anti-war movement; removing two conservative Supreme Court justices; potentially expanding the court and weakening the filibuster.…