Cameron may only have had three hours sleep in the last 36 hours but when he emerged to sell his EU renegotiation deal after marathon talks in Brussels he was impassioned, articulate and made the case for Britain to remain in the EU in a manner that no other pro-European has yet managed to achieve.
His rhetoric was soaring as he made the 'big picture' arguments of security, economic prosperity and history to explain why he would be putting his “heart and soul” into the campaign to stay in. Even cynical journalists who've followed him for years were impressed.
As this article points out, Michael Gove coming out as 'Out' is not much of a coup for the Leave campaign. He's not a terribly popular figure. If he couldn't sell his educational reforms to the public, I doubt he's going to be successful at selling the case for Brexit.
I remember Polly Tonybee engaging in a head to head debate with Gove on television years ago. She pointed out that as soon as Gove started talking about the EU, his eyes went wild and he came across as a little bit bonkers. She was right. As soon as Gove starts lecturing people about the evils of the EU, the public will switch off.