A first test for Platner and other key races to watch in Tuesday’s primaries in Maine and beyond

By Terence Burlij, Eric Bradner, CNN (CNN) — Primaries in four states on Tuesday will offer clues about how much tolerance voters have for candidates embroiled in controversies, while testing President Donald Trump’s sway in a crowded Republican primary and setting up a key race for governor in one of the country’s premier presidential battleground