The campaign says it's
FULL meaning there are no available slots.
But wait:

After more than a year on a hiatus, the first thing you do is to apply to a full/closed signature campaign. Now you attract attention on your account.

According to his post history, he writes mostly in Turkish language. While applying he used:
Btctalk name: BigRasputin
Rank: Sr. Member
Current post count: 1050
bustadice Name: sklogw
Wear appropriate signature: I will wear signature if accepted.
Looking in bitcointalk members list, there is a user with name
sklogw, that writes also in Turkish. Hmm...
