Huntington--like Buchanan--claims not to be a cultural  He is defending the integrity of all cultures, theirs and ours.
( Huntington ( ( -- ( ( like Buchanan ) -- ) ) ( ( claims ( not ( to ( be ( ( a cultural ) ( He ( is ( defending ( ( the integrity ) ( of ( ( ( ( ( all cultures ) , ) theirs ) and ) ours ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Huntington)) (PRN (: --) (PP (IN like) (NP (NNP Buchanan))) (: --)) (VP (VBZ claims) (S (RB not) (VP (TO to) (VP (VB be) (NP (NP (DT a) (JJ cultural)) (SBAR (S (NP (PRP He)) (VP (VBZ is) (VP (VBG defending) (NP (NP (DT the) (NN integrity)) (PP (IN of) (NP (NP (DT all) (NNS cultures)) (, ,) (NP (PRP theirs)) (CC and) (NP (PRP ours)))))))))))))) (. .)))
Huntington and Buchanan both defend others cultures as well as their own.
( ( ( Huntington and ) Buchanan ) ( both ( ( defend ( ( ( others cultures ) ( as ( well as ) ) ) ( their own ) ) ) . ) ) )
(ROOT (S (NP (NNP Huntington) (CC and) (NNP Buchanan)) (DT both) (VP (VBP defend) (NP (NP (NNS others) (NNS cultures)) (CONJP (RB as) (RB well) (IN as)) (NP (PRP$ their) (JJ own)))) (. .)))