The most likely replacement for Graham Platner, if he exits the Maine Senate race, appears to be Janet Mills , Maine’s governor, based on current reporting.

Why Mills stands out

  • Reporting says Democratic leaders see Mills as the smartest do-over option if Platner withdraws.
  • Coverage also notes that state and national Democrats are already looking at her as the strongest name to quickly reset the race.
  • Other possible backups mentioned include Democrats like Troy Jackson , Nirav Shah , and Chellie Pingree? The reports I found point more clearly to Mills as the leading fallback, though.

What makes this uncertain

  • Platner has not definitely withdrawn yet, so the replacement question is still conditional.
  • Maine party rules would give Democrats a short window to name a replacement, so the final choice could still shift quickly.

Quick read

If you want the single most likely name , it’s Janet Mills.

TL;DR: Janet Mills is the front-runner to replace Graham Platner if he drops out, but the race is still in flux.