Lieutenant Governor of Maine

The following is a complete, and current list of lieutenant governors of the 50 U.S. States, and its Territories. Currently, 25 states elect a lieutenant governor on a ticket with the governor, while 18 states elect a lieutenant governor separately. In West Virginia, the President of the Senate, as elected by the senators, serves as lieutenant governor. In Tennessee, the senators elect a Speaker of the Senate, who in turn serves as lieutenant governor. Five states do not have a lieutenant governor. In the 50 states, five territories and District of Columbia, there are currently 38 Republicans, 15 Democrats, two Progressives and one Independent serving as lieutenant governor or serving as the first in the line of succession.

In the table below, Term ends indicates the year the current lieutenant governor will leave office, or the year of the next election, whichever is first; a notation (term limits) after the year indicates that the current lieutenant governor is ineligible to seek re-election in that year. A notation of (Retiring) after the year indicates that the current lieutenant governor is leaving office that year, having not sought re-election. A notation of (Defeated) indicates that the current lieutenant governor was defeated for re-election.

Five states do not have a position of lieutenant governor. In these cases, the Secretary of State or the President of the Senate is next in line for the governorship.

...
Wikipedia