Car with a balloon

Hi everyone, I was just wondering about this...

If I tie a balloon outside a car, using a moderately long string, and the car heads for a left turn on the road with constant speed, then while turning, what would be the path followed by the balloon?

I was thinking that maybe the balloon would tend to go in a circular path because of the pseudo force acting perpendicular to its initial direction, but some disagree... Any suggestions?