The message is that great change must come, dictated by the roar of the Brexit vote. She has determined what the roar meant.
Ukip donor Arron Banks believes Andrea Leadsom is the best bet for getting as much distance between the UK and the EU post the referendum.
David Cameron will now have to assess whether the price of buying peace in his party was extortionately high.
It is a massive blow to the political establishment, its biggest reverse in living memory. Immigration was the spur for many voters but this decision has consequences way beyond that issue.
The Electoral Commission designates Vote Leave as the leading Brexit campaign group in the run-up to June's referendum on EU membership, but it may face a legal challenge.