I can tell you that my friend is a sincerely devout liberal who, when Obama ran, took a bus to eastern Pennsylvania to knock on doors whenever she had a day off. She’s grassroots.
There’s lots of exceptions... your friend is one...
That's essentially what they did in Alabama; ensured every single registered voter who was likely to vote for Doug Jones got to the polls.
Meanwhile, 650,000 Trump-voting Alabamans stayed home. I suspect most of them assumed Moore would win but didn't personally want to be a part of it.