lacking any sense of commitment to 
(ROOT (S (VP (VBG lacking) (NP (NP (DT any) (NN sense)) (PP (IN of) (NP (NP (NN commitment)) (PP (IN to))))))))
(ROOT (S (VP (VBG ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (NN )) (PP (IN ))))))))