Is Poker even a Sport?

Last night on ESPN 2 they aired the world series of poker final table. I stayed up for a little while and watched just to see what was up. I enjoy to play poker with my friends and will watch it on occasion for a short period of time. While I was watching last night I was thinking, is this really a sport? Though it was on a sports TV network does it really constitute as a sport? I personally think it falls in the same category as NASCAR. Either way I was just amazed at the amount of money you win for not even winning the whole thing. There was some guy who got over a million dollars and he got like 10th.