Clare has today confirmed that she is backing Yvette Cooper to be the next leader of The Labour Party, saying she has "unparalleled ambition for Britain."
Clare made her announcement in a blog for The Huffington Post, saying:
"If the Labour Party is to win again, we must reach beyond our traditional base. We need at our core a desire to represent the south as much as the north and we must understand as clearly the needs and desires of people in Cornwall as those in Cumbria.
"It means we need a leader with the broadest possible appeal, able to unite all sections of our party and our country, ready and willing to tackle David Cameron head-on and who has a clear and ambitious vision for the future of Britain.
"The Labour Party needs a Prime Minister in waiting, and that is why I am backing Yvette Cooper to be my party's next leader.
"I share her obvious pride in our values and traditions but I welcome her willingness to challenge old orthodoxies. As The Labour Party's first elected woman leader, she will live those values and she will honour our history. I believe she will prove an unashamed champion of our successes, with the courage and humility to learn from our defeats.
"In every announcement I have seen her make, at every hustings performance, Yvette shows an unparalleled vision for Britain's future, its economy and its people.
"I'm excited by Yvette's determination to revolutionize our approach to science and research, to champion the white flashing constellations of the networked world. Her aim, to increase investment in science and research to 3% of GDP will deliver millions of new high-skilled, high-paid jobs throughout our country, long into the future. It is, as she says, a down payment on a different future for Britain, for our children and their children after them.
"And Yvette shares my belief that Britain should remain in the European Union. We should be leading in Europe, not leaving by the backdoor, and I believe Yvette has the necessary skills to restore Britain's place in world affairs, so badly diminished by David Cameron."