▁he ▁no ▁longer ▁planned ▁to ▁run ▁for ▁office ▁but ▁would ▁instead ▁leave ▁the ▁United ▁States ▁to ▁res ide ▁in ▁South ▁America ▁for ▁a ▁time . ▁ ▁In ▁July ▁ 2 0 1 6 , ▁Mad sen ▁switched ▁from ▁the ▁Republican ▁to ▁the ▁Libert arian ▁Party ▁and ▁end ors ed ▁Gary ▁Johnson ▁for ▁president . ▁ ▁Legisl ation ▁▁ 2 0 1 6 ▁spons ored ▁b ills ▁ ▁Notable ▁legisl ation ▁In ▁the ▁ 2 0 0 8 ▁session ▁of ▁the ▁state ▁legisl ature , ▁Mad sen ▁was ▁chief ▁spons or ▁of ▁S B ▁ 2 1 0 , ▁a ▁bill ▁that ▁required ▁proof ▁of ▁citizens hip ▁to ▁be ▁presented ▁in ▁order ▁for ▁Ut ah ns ▁to ▁register ▁to ▁vote . ▁ ▁Local ▁Salt ▁Lake ▁City ▁media ▁err one ously ▁reported ▁that ▁S . B . ▁ 2 4 7 , ▁which ▁Mad sen ▁spons ored , ▁would ▁honor ▁Ut ah ▁native ▁gun ▁cre ator ▁John ▁M . ▁Brow ning ▁on ▁the ▁current ▁Martin ▁Luther ▁King ▁Jr . ▁hol iday , ▁as ▁Mad sen ▁had ▁originally ▁proposed . ▁He ▁was ▁critic ized ▁greatly ▁for ▁this . ▁However , ▁the ▁language ▁that ▁Mad sen ▁ultimately ▁put ▁into ▁the ▁bill , ▁S . B . ▁ 2 4 7 S 0 3 , ▁which ▁passed ▁both ▁houses ▁of ▁the ▁Ut ah ▁Legisl ature ▁and ▁was ▁signed ▁into ▁law , ▁recognized ▁John ▁M . ▁Brow ning ▁on ▁January ▁ 2 4 , ▁ 2 0 1 1 . ▁ ▁In ▁ 2 0 1 5 , ▁Senator