But there is also someone else interested in the flowers and beans...
I'm not sure what the identification of the ant is. I suspect it's a fire ant ( Solenopsis ), because if one of them bites me my foot/hand will swell up. But then again I always react dramatically to insect bites.
But it doesn't have the darker body associated with the fire ant.
In the GardenWeb forum there is a discussion on this, and the consensus is that the red ants/fire ants are just licking secretions, not damaging the plant. I'm not sure, the flower that I took this photo of is now withered... Does anybody know?