Well, Santo was a third baseman, but I will answer your question in two parts. One, hitters in pitchers eras tend to be rated unfairly. Hall of Fame voters are pretty simple minded, and in terms of history, they tend to not differentiate between numbers of one era or another. Think about the home run chase... people talk about Bonds versus Aaron, not Bonds in the smallpark era versus Aaron. Players don't have their raw numbers adjusted based on the era that they played. So, as Bill James notes, the most overlooked players in the HOF discussion are (a) hitters in pitchers eras, and (b) pitchers in hitters eras. As Rob and I discussed above, Santo's numbers, when taking the era into account, are comparable to Sosa's. But when you look at their raw numbers, clearly Sosa is ahead. OK, so there's one explanation for what you talked about above. The other is that third basemen are the most under-represented group in the HOF. There are a few undeserving HOFers at 3B - see Fred Lindstrom - but there are also a few third basemen who belong in the Hall who are not in there. People have the impression that the corner positions on the diamond are the offensive positions - LF, RF, 1B and 3B - but the truth is that 3B is much less of an offensive position than the other three. Compare the best third baseman of all time (we'll say Mike Schmidt) to the greats at 1B (Gehrig, Foxx), LF (Ted Williams, Musial, Bonds, Henderson) and RF (Ruth, Aaron). The top guys at other positions are better. Finally, players who have monster years get more recognition than players who are consistently good for many years. People remember Sosa and McGwire in 1998, and that year will be talked about in 30 or 40 years down the road. Santo was consistently good for many years, but didn't have the one signature year that people remember him by. And, while it's unfair to blame the Cubs' incompetence on Santo, they didn't make the playfoffs during his time on the team. So, combine the facts that Santo was a hitter in a pitcher's era, played an the most underappreciated position, didn't have a signature year, and didn't play for a winner, and he's probably the most glaring omission from the HOF.