close Republican Sen Susan Collins says Maine voters will conclude that Democratic challenger Graham Platner is too extreme Asked by Fox News Digital if Democratic Senate challenger Graham Platner is too far to the left, GOP Sen. Susan Collins says ‘I believe that will be the conclusion of Maine voters.' NEW You can now listen to Fox News articles! As she runs for a sixth six-year term in the U.S. Senate in left-leaning Maine, Republican Sen. Susan Collins is now officially her party's nominee