(S (S (SBAR (IN Whilst) (S (VP (VBG speaking) (PP (IN as) (NP (BASENP (NN part)) (PP (IN of) (NP (BASENP (PRPD his) (NN campaign)) (PP (IN for) (NP (BASENP (DT the) (NNP U.S.) (NN presidency)) (PP (IN in) (BASENP (NN 2012)))))))))))) (COMMA ,) (S (BASENP (NNP Rick) (NNP Santorum)) (VP (VBZ has) (VP (VBN had) (S (VP (TO to) (VP (VB answer) (NP (NP (BASENP (NNS questions)) (PP (IN from) (NP (BASENP (NNS supporters)) (PP (IN of) (BASENP (NN LGBT) (NNS rights)))))) (PP (VBG regarding) (NP (NP (PRPD his) (NP (JJ controversial) (BASENP (JJ political) (NNS positions)))) (PP (IN on) (NP (BASENP (NNS issues)) (VP (VBG pertaining) (PP (TO to) (BASENP (PRP them)))))))))))))))) (PERIOD .))