Votes such as last night's are no longer mere rubber stamps but a binding convention that can change the foreign policy of a government.
We should feel proud of a Parliament that seeks to be cautious in matters of war and peace, rather than gung-ho.
Cameron's decision to take intervention off the table means Miliband will never have to decide whether to support military action.
The names of the 224 Labour MPs, 30 Conservatives 9 Liberal Democrats and others who combined to defeat the motion authorising the possible use of military force against Syria.
The PM is forced to rule out military action after motion is defeated by 285 votes to 272.
Shadow transport minister said in the debate: "I’m opposed to military intervention in Syria, full stop."
Vice-chair Michael Dugher writes to Jeremy Heywood demanding that Craig Oliver apologise and withdraw the "infantile and irresponsible" remark.
"I do not rule out supporting the Prime Minister but I believe he has to make a better case than he did today".
Politicians, far more than commentators, have a moral and a legal duty to proceed with caution.
The party opposes intervention in Syria and elsewhere but still wants to increase the defence budget by £17.4bn to £50bn.