The members of the Baseball Writers’ Association of America are given the option to make their Hall of Fame ballots public every year.
Of the 549 voters (full list here), only 133 chose to make their ballots public.
Those ballots are viewable here.
Unfortunately, the voters who threw a vote at Darin Erstad and two at Aaron Boone didn’t make their ballots public.
Even Erstad was wondering which voter had been so charitable.