"She was the most wise of counsellors, the most loyal and supportive of colleagues, and the best of friends", he said.
Appearing on the Andrew Marr Show this morning, former Labour director of communications and godfather to Dame Tessa's children Alastair Campbell said: "She really is the best of politics, the best of humanity, and as Tony Blair said this morning, there really aren't many like her".
British Olympic Association Chairman Sir Hugh Robertson pays tribute to Dame Tessa Jowell after she sadly passed away yesterday.
He said: "Tessa was a positive life force who never stopped smiling and never stopped being dedicated to other people".
She played the pivotal role in gathering, and maintaining government support for a bid and subsequently putting in place the structures necessary to deliver The Games.
Prime Minister Theresa May said the dignity and courage with Dame Tessa confronted her illness was "humbling" and "inspirational", and that her campaigning was a "lasting tribute to a lifetime of public service".
"The thoughts of the whole British Olympic family are with her family at this hard time".
He said: "No politician deserves greater credit for the Games".
Former prime minister Gordon Brown said Dame Tessa would be remembered for her "courage, strength and compassion for others".
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"But if they were misleading, uncaring or obfuscating she would be tougher than anyone - and forensic with it".
"And long after the Games were over, Tessa continued to fight for their legacy".
"Her contribution to the Olympic and Paralympic Games is easily defined - quite simply, without Tessa there would have been no London 2012, and without Tessa they would not have been the success they were". Without her the sporting landscape of the United Kingdom would have looked very different, and so many other tangible legacies left dormant. She was later made Minister for the Olympics.
Lord Blunkett said: "It will be Tessa as a person who I will remember".
He said her impact on politics was enormous and "everything she touched turned to gold in some way, whether it was advancing equal pay for women, starting Sure Start - which is an vast programme for children in our country - or of course bringing the Olympics to Britain".
John Bercow, Speaker of the House of Commons, described Dame Tessa as an "indefatigable campaigner who translated care from a word to a deed at every turn".
Raymond Simonson, CEO of JW3, also tweeted his tribute, saying: "Very sad to read that Tessa Jowell has died".
"I hope that this debate will give hope to other cancer patients, like me, so we can live well together with cancer, not just dying of it".
"Tessa was not just a close friend, she was a life enhancer", he wrote on Twitter.