I agree with all that's been said, but let me emphasize some parts of it in particular.
Above all things, Sam loved Frodo. Which is why he was perfect for his job as a "supporter" and "pusher." After Frodo, Sam loved Middle Earth. To be more specific, he loved the Shire and life as he knew it. If Gandalf had come to him first, no doubt he would have dived behind his wheelbarrow, told Gandalf to find some brave warriors to get rid of the ring, and then hung out with Rose. While he knew that the ring had to be destroyed, he most certainly did not feel he was the one to do it. Frodo on the other hand, was not tied to Middle Earth as much as Sam. Sure he had some friends and a house, but other than that he was pretty much alone. I think he knew deep inside that he was meant to do it, too. I'm not sure if he had any particular characteristics that made him the "better" one to destroy the ring. But, apparently, he was born with a mission and any qualities that would help him with that mission.
Ring-getting-rid-of genes [img]smilies/wink.gif[/img]
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At the name of Jesus every knee should bow and every tongue should confess that Jesus Christ is Lord. - Phil. 2:10-11
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