Alleged abuse took place more than four decades ago
Former House speaker allegedly agreed to $3.5 million in payments
GOP opposition and past failures stand in the way
Ill. Republican has faced questions about sexual orientation
Claim couples hurt by state bans on marriage equality
Real-life partners featured in TV spot
Event billed as largest testing event in U.S.
‘A historic moment’ for state
Critics said measure fell outside lawmakers' expertise
LGBT advocates say success demonstrates 'turning point' in the GOP
