Human: What is the name of the Liberal Democrat senator who threatened to block government legislation if the Coalition party-room failed to allow a conscience vote on his (Leyonhjelm's) bill to legalise same-sex marriage? Assistant: 
The Liberal Democrat senator who threatened to block government legislation if the Coalition party-room failed to allow a conscience vote on his (Leyonhjelm's) bill to legalise same-sex marriage is David Leyonhjelm. He is also known as "Senator Fuck Off".