At the May 18 poll, 40 of the nation's 76 senators are up for election.AAP/Mick TsikasThere are 76 senators – 12 in each state and two in each territory. At a normal half-Senate election, half the state senators and all territory senators are elected, so 40 of the 76 senators are up for election on May 18. As tied votes are lost, it takes...
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