Affirmative action draws people to work they never considered before What does it mean?

This is a subjective answer, so this is my opinion. I think you will agree too though.

An affirmative action is any action that you agree with or see good cause in.

So the phrase "Affirmative action draws people to work they never considered before" means that if someone sees something being done that they agree or side with, they will become a part of it.

I.E. If a commercial fisherman learns how the fish he catches are slaughtered and processed and finds a group of people who fight for humanely slaughtered animals, then he may quit his job and fight for what he thinks is right.

The above example is extreme. Though the phrase says work, it won't always mean an occupation. In its simplest form, this means supporting a group of activists that fight for something you believe is right.