▁controvers ies , ▁an ▁elect oral ▁reform ▁was ▁conducted ▁in ▁ 1 9 8 6 : ▁ ▁The ▁number ▁of ▁members ▁of ▁the ▁Chamber ▁of ▁Deput ies ▁being ▁elected ▁by ▁proportional ▁representation ▁( pl ur in om inal es ) ▁was ▁increased ▁from ▁ 1 0 0 ▁to ▁ 2 0 0 ▁and ▁allowed ▁for ▁a ▁better ▁representation ▁of ▁opposition ▁parties . ▁ ▁The ▁Senate ▁is ▁composed ▁of ▁two ▁sen ators ▁from ▁each ▁state ▁and ▁two ▁from ▁the ▁Federal ▁District ▁of ▁Mexico . ▁An ▁election ▁of ▁half ▁of ▁its ▁members ▁takes ▁place ▁every ▁three ▁years . ▁ ▁The ▁Legisl ative ▁Assembly ▁of ▁the ▁Federal ▁District ▁of ▁Mexico ▁was ▁created . ▁ ▁Split ▁in ▁the ▁P RI ▁Cu au ht ém oc ▁C ár den as ▁and ▁other ▁polit icians ▁from ▁the ▁Institution al ▁Revolution ary ▁Party ▁( PRI ) ▁announced ▁the ▁creation ▁of ▁the ▁Democratic ▁Current ▁( Cor ri ente ▁Democr ática ) ▁within ▁the ▁P RI . ▁The ▁Democratic ▁Current ▁demanded ▁the ▁establishment ▁of ▁clear ▁rules ▁for ▁the ▁selection ▁of ▁the ▁party ' s ▁president ial ▁candidate . ▁When ▁they ▁failed , ▁C ár den as ▁and ▁P orf i rio ▁Mu ñ oz ▁L edo ▁left ▁the ▁P RI ▁and ▁joined ▁the ▁National ▁Democratic ▁Front ▁( Fr ente ▁Democr ático ▁Nacional ), ▁a ▁loose ▁al liance ▁of ▁left - wing ▁parties . ▁ ▁Ass ass ination ▁attempt ▁On ▁May ▁ 1 , ▁ 1 9 8 4 , ▁an ▁anti - g overn ment ▁activ ist ▁named ▁José ▁Antonio ▁Pala cios