Kevin Rudd's defence of gay marriage on Q&A last night got people talking today, after the PM quoted St Paul in response to a question from a Christian pastor who asked how he could support same-sex unions "if you call yourself a Christian".

The pastor in the Brisbane audience had asked the PM how he could support gay marriage when the Bible teaches that marriage should be between a man and a woman.

Mr Rudd responded by suggesting that line of thinking would also make slavery an acceptable proposition.

But away from that debate the latest polls bear more bad news for Labor, with Newspoll figures showing the party struggling in key marginals in Mr Rudd's home state of Queensland.

Meanwhile Opposition Leader Tony Abbott has warned Labor it would be "committing suicide twice" if it tried to block his efforts to repeal the carbon tax after the election.

And Liberal candidate Fiona Scott is on the defensive linking asylum seekers to traffic congestion and hospital waiting times in western Sydney.

Look back at how the day's events unfolded in our blog: