The night ended with hundreds of thousands of votes still to be counted, and the outcome still unclear in key states he needs if he is to win against Democrat Joe Biden.
McBride won in a heavily Democratic district stretching from northern Wilmington to the Pennsylvania border. She joins several other transgender legislators around the country but will be the first transgender state senator.
To do so, AP uses regional stringers who collect votes at a local level, while other AP journalists gather results from state or county websites, as well as via electronic data feeds from states.
President Donald Trump has won Alabama, Mississippi, Oklahoma and Tennessee, while Democrat Joe Biden has won Connecticut, Delaware, Illinois, Maryland, Massachusetts, New Jersey and Rhode Island.
Steady lines of voters on Tuesday flocked to the polls in key battleground states that will decide whether President Donald Trump or Democrat Joe Biden will serve the next four years in the White House.