It looks like Senator Susan Collins of Maine is in real trouble with her home state voters. That's not good, since she must run for re-election in the 2020 election.
Only 35% of Maine voters approve of the job she is doing, while 50% disapprove. If the election was held now, she would lose to a generic Democratic opponent by 3 points (44% to 41%). And if she opposes impeaching Trump, that margin would grow to 7 points (47% to 40%).
The charts above are from the latest Public Policy Polling survey -- done between October 11th and 13th of 939 Maine voters, with a 3.2 point margin of error.