The early jockeying to replace Graham Platner on the ballot in Maine is coming with a warning from liberals who want Senate Minority Leader Chuck Schumer (D‑NY) to play no part in choosing his successor.Platner’s expected withdrawal, sparked by a bombshell report alleging sexual assault, has the Left rushing to find a replacement who embraces the same platform that voters rewarded in the Democratic primary last month, with several eyeing Troy Jackson, a former state Senate president backed by Sen. Bernie Sanders (I‑VT).Front of mind for them is how Schumer fought to displace Platner, and early progressive calls for him to drop out were paired with open hostility toward Schumer’s involvement …