▁( 1 9 6 0 ▁pop . ▁ 3 9 7 ). ▁In ▁Reyn olds ▁v . ▁Sim s , ▁the ▁United ▁States ▁Supreme ▁Court ▁comp elled ▁all ▁states ▁to ▁draw ▁up ▁districts ▁with ▁equal ▁population . ▁As ▁such , ▁boundaries ▁were ▁changed ▁to ▁comp ly ▁with ▁the ▁r uling . ▁ ▁Le ad ership ▁ ▁The ▁Lieutenant ▁Governor ▁is ▁the ▁ex ▁offic io ▁President ▁of ▁the ▁Senate , ▁and ▁may ▁only ▁cast ▁a ▁vote ▁to ▁break ▁a ▁tie . ▁The ▁President ▁pro ▁temp ore ▁is ▁elected ▁by ▁the ▁majority ▁party ▁c au cus , ▁followed ▁by ▁confirm ation ▁of ▁the ▁full ▁Senate . ▁Other ▁leaders , ▁such ▁as ▁the ▁majority ▁and ▁minor ity ▁leaders , ▁are ▁elected ▁by ▁their ▁respective ▁party ▁c auc uses ▁according ▁to ▁each ▁party ' s ▁strength ▁in ▁the ▁chamber . ▁ ▁The ▁current ▁President ▁pro ▁tem ▁is ▁Dem ocrat ▁T oni ▁At kins ▁of ▁San ▁Diego . ▁The ▁Minor ity ▁Le ader ▁is ▁Republican ▁Sh annon ▁Gro ve ▁of ▁B akers field . ▁ ▁Term s ▁of ▁office ▁▁ ▁Each ▁state ▁sen ator ▁represents ▁a ▁population ▁roughly ▁equivalent ▁to ▁the ▁State ▁of ▁Del aware . ▁As ▁a ▁result ▁of ▁Proposition ▁ 1 4 0 ▁in ▁ 1 9 9 0 ▁and ▁Proposition ▁ 2 8 ▁in ▁ 2 0 1 2 , ▁members ▁elected ▁to ▁the ▁legisl ature ▁prior ▁to ▁ 2 0 1 2 ▁are ▁restricted ▁by ▁term ▁limits ▁to ▁two ▁four - year ▁terms ▁( e ight ▁years ), ▁while ▁those ▁elected ▁in ▁or ▁after