Dan, as you well know it's the party that elects the leader, not voters.
Your logic that voters should be given the opportunity to vote out an MP is flawed, imagine if that happened and we got Shorten as PM then we wait another 3 years to vote Shorten out
All good and well for you to say you think Abbott could have won the next election but you are not a liberal party MP who would be risking being back in opposition or losing their seat
