Have the Greens done a secret deal with the Liberals to be placed higher than Labor on the Libs' how-to-vote card in exchange for support for the Coalition's Senate voting reform bill? Labor says a dirty deal has been done, but the Greens say it ain't so.

At the last election, one of Tony Abbott's "captain's calls" was to preference Labor ahead of the Greens across the country. It was a reaction to the minority government in the House of Representatives, which Abbott regarded as a "failed experiment".