Does carbonation cause straws to float in water?

[cragar]

So when i go to a restaurant and order a coke with no ice and the waitress brings it back with a straw in it the straw never stays in the glass. When i get it the straw is resting on the edge of the glass with the end barely in the coke, my guess is that it is held up with surface tension. But when I try to put the straw back in the glass normally it slowly starts to rise back up. But if the straw is just in water it will stay put at the bottom of the glass. So is it possible that some of the carbonation is bubbling up and hitting the straw making it go up?

 

[russ_watters]

It's the bubbles attaching themselves to the side of the straw and growing.

 

[cragar]

thanks for your answer, That makes sense