Michelle Grattan discusses the week in politics with the University of Canberra’s deputy vice-chancellor, Nicholas Klomp.

Topics of discussion include:

• the postal ballot to change the Marriage Act to allow same-sex marriages;

• the differences in Malcolm Turnbull’s and Bill Shorten’s “yes” campaigns;

• the implications for Turnbull if the vote is “no”;

• Tony Abbott’s “no” campaign;

• the High Court challenge against the postal vote; and

• the impact on the Senate of senators’ eligibility issues.

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond the academic appointment above.