democratic senators missouri 20th hour filibuster tuesday try block republican-proposed amendment state constitution would prohibit penalties religious group discriminate same-sex couple democratic caucus begin filibuster p.m. monday members say plan continue wednesday filibuster prolong debate often around clock aim block progress initiative propose amendment missouri late series measure introduce around country conservatives reaction last year u.s. supreme court legalization same-sex marriage measure seek protect religious group company fin punish decline provide service wed cake flower same-sex couple offensive thing would put discriminatory language constitution state would also put general revenue state risk senate minority leader joe keaveny democrat tell reuters point similar religious freedom restoration act indiana lead group threaten cancel conventions indianapolis resolution amend constitution sjr 39 pass senate would go state house representatives missouri voters approval republicans dominate house missouri general assembly 24 34 senate seat 116 163 house seat keaveny say republicans could respond filibuster force vote resolution amend constitution say would unusual step could withdraw resolution put informal calendar debate late date republican senator bob onder sponsor resolution say resolution discriminate protect vulnerable religious institutions fight fairness right people freely live faith infringe right others say language propose amendment say prohibit state impose penalty religious organization act accordance sincere religious belief concern sex marriage include refusal perform sex marriage ceremony allow sex wed ceremony perform religious organization property although amendment mention company keaveny say democrats believe would allow businesses claim religious belief defense refuse service same-sex couple missouri democrats filibuster propose gay discrimination amendment