Another Landmark fan holds sway in a broader arena: ???Martha Stewart said on her show that our chardonnay was her favorite wine to serve at a wedding,??? Colhoun proudly notes.Additional fun factor: Visitors to Landmark???s tasting room can pick up a souvenir they won???t find at other wineries: key chains, puzzles, and other items featuring the iconic John Deere tractor. (John Deere is Michael C