▁bo ating ▁in ▁the ▁area . ▁ ▁Cong r essional ▁eth ics ▁Brown ▁is ▁an ▁av id ▁supp orter ▁of ▁b ipart isan ▁co operation ▁among ▁members ▁of ▁Congress . ▁He ▁has ▁said ▁that ▁his ▁goal ▁in ▁Congress ▁is ▁" to ▁work ▁in ▁a ▁b ipart isan ▁and ▁b ic amer al ▁manner ." ▁According ▁to ▁a ▁Cong r essional ▁Week ly ▁study , ▁in ▁ 2 0 1 1 ▁Brown ▁was ▁the ▁second - most ▁b ipart isan ▁U . S . ▁Senator , ▁voting ▁with ▁his ▁own ▁party ▁only ▁ 5 4 % ▁of ▁the ▁time . ▁By ▁comparison , ▁his ▁partner ▁in ▁the ▁Massachusetts ▁Senate ▁deleg ation , ▁Senator ▁John ▁Ker ry , ▁voted ▁with ▁his ▁own ▁party ▁ 9 6 % ▁of ▁the ▁time , ▁and ▁the ▁entire ▁Massachusetts ▁deleg ation ▁to ▁the ▁House ▁of ▁Representatives ▁voted ▁with ▁their ▁party ▁over ▁ 9 0 % ▁of ▁the ▁time . ▁This ▁cent r ism , ▁though ▁he ▁was ▁also ▁sometimes ▁described ▁as ▁libert arian ▁in ▁his ▁ide ology , ▁had ▁earned ▁him ▁criticism ▁from ▁the ▁movement ▁conserv atives ▁some ▁of ▁whom ▁considered ▁him ▁a ▁R IN O ▁or ▁ins u fficient ly ▁conserv ative . ▁ ▁During ▁the ▁second ▁half ▁of ▁ 2 0 1 1 , ▁Brown ▁wrote ▁the ▁ 2 0 1 1 ▁version ▁of ▁the ▁S TO CK ▁Act , ▁a ▁move ▁to ▁ban ▁ins ider ▁trad ing ▁in ▁Congress . ▁The ▁act , ▁which ▁was ▁co - written ▁with ▁Senator ▁K irst en ▁Gill ibr and