Like Gandalf says, Gollum was MEANT to have the Ring. It was all part of the plan. He plays a key part in the destruction of Evil, ironically. I mean, everything he did contributed to the downfall of Sauron--even before he met up with Frodo and Sam.
No, Smeagol was not a Hobbit, but his race was close enough for him to be compared to Frodo. The main reason the halfling trusts Gollum is because Gollum is a mirror image of what Frodo would become if he failed, and kept the Ring to himself.
Originally posted by nephalim27
Smeagol WAS a hobbit! He was a Stoor, which is the breed of Hobbit most represented in modern hobbits. He has some differences that happened over the age, of course, but he was pretty much a hobbit.