void Start(){   

StartCoroutine(coUpdate());

}

IEnumerator coUpdate(){   

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
GameObject selected  = null;

while(true){   

if (Input.GetMouseButtonDown(0)){   
ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray,out hit,Mathf.Infinity))
if (hit.collider.CompareTag("State"))
selected = hit.collider.gameObject;

}

yield return 0;
}

}