Deadspin.com announced Miami Herald columnist Dan Le Batard had turned his ballot over to the website, which allowed readers to vote on how it should be cast.
"I hate all the moralizing we do in sports in general, but I especially hate the hypocrisy in this," Le Batard said in remarks posted by Deadspin. "'I always like a little anarchy inside the cathedral we've made of sports."
BBWAA Secretary-Treasurer Jack O'Connell declined comment.
Maddux reached the major leagues in 1986 and Glavine a year later. They become the first primarily starting pitchers to enter the Hall whose careers began after Bert Blyleven, who debuted in 1970.
Eighth on the wins list with a 355-227 record and a 3.16 ERA over 23 seasons, Maddux won four consecutive Cy Young Awards from 1992-95 and a record 18 Gold Gloves with the Chicago Cubs, Atlanta, the Los Angeles Dodgers and San Diego. An eight-time All-Star, he won at least 13 games in 20 straight seasons.
Among pitchers with 3,000 innings whose careers began in 1921 or later — after the Dead Ball Era — Maddux's 1.80 walks per nine innings is second only to Robin Roberts' 1.73, according to STATS.
Glavine, a 10-time All-Star and a two-time Cy Young winner, was 305-203 over 22 seasons.
A two-time AL MVP, Thomas hit .301 with 521 homers and 1,704 RBIs in 19 seasons with the Chicago White Sox, Toronto and Oakland.
Writers who have been members of the BBWAA for 10 consecutive years at any point were eligible to consider the 36-player ballot.
Next year's vote will be even more crowded when Randy Johnson, Pedro Martinez, John Smoltz, Carlos Delgado and Gary Sheffield become eligible, five years after their retirements. The BBWAA last month formed a committee to study whether the organization should ask the Hall to change the limit of 10 players per ballot.
In a sign of how some newly eligible players have taken votes from holdovers, Lee Smith dropped to 171 from 272 last year, his percentage falling to 29.9 from 47.8.