Bernard Keane's Canberra: A Coalition reunification, even as the Liberals contemplate "non-existence"

Parliament returns for the second half of the sitting fortnight, with the Liberal Party and The Nationals reunited, again. But all is not calm. Liberal senator Jane Hume warned that her party risked "non-existence" if it doesn't adjust. And: what exactly is social cohesion?

• Guest: Bernard Keane, politics editor of Crikey