By Marcus Leach
On Monday David Cameron and Labour former Home Secretary, John Reid, shared a platform to warn how changing the way Britain elects its MPs would end the historic principle of "one person, one vote".
Mr Cameron said that he felt in his "gut" that AV was wrong.
"Politics shouldn't be some mind-bending exercise," he said.
"It's about what you feel in your gut, about the values you hold dear and the beliefs you instinctively have. And I just feel it, in my gut, that AV is wrong."
The Prime Minister went on to explain how AV "is obscure, unfair, expensive and it could mean people who come third in elections will end up winning."
John Reid criticised the 'Yes to AV' campaign, supported by his party's leader, Ed Miliband, for trying to "change the rules of the game" to make up for bad electoral results.
Lord Reid suggested that we could learn a few things from the sportsmen and women who represent our country: "When they lose a contest, they pick themselves up, get back into the game and come back to fight another day. They don't moan on about moving the goalposts to make things easier next time. And they don't expect gold medals for finishing second, third or fourth."
Lord Reid said: "The answer for losing parties is to work harder to win the confidence of the voters, not to introduce a system that tries to change losers into winners by some magical complicated mathematical formula."
Mr Cameron urged people to get out and vote No: "The biggest danger right now is that Britain sleepwalks into this second-rate system, waking up on May 6th with a voting system that damages our democracy permanently. We must not let that happen. So get out there and fight, and get out there and win."
Lord Reid concluded: "It's your vote. Your right to a fair say - a say and a vote equal to everyone else. Don't let them take that right away. Vote No on the 5th of May."