The pledge commits the candidates to foster "constructive democratic debate" and to treat their opponents with dignity and respect.
Kim Leadbeater said it was fine for politicians to "passionately disagree", but that they must carry out their debates on a "human level".
Neil Coyle MP called the television presenter a "waste of space, air and skin" in a heated Twitter spat.
MPs across the House called for Parliament to moderate its language in a heated night in the Commons.
A neo-Nazi who plotted to kill Labour MP Rosie Cooper has been jailed for at least 20 years.
Political commentator Peter Oborne has said that “the whole political class gets upset” when people of “politically acceptable views get attacked” but not when it is people of “non-politically correct views”.
Brendan O'Neill says we have to question the #MeToo and Time's Up movements in light of the Brendan Cox affair
Brendan Cox says Donald Trump's state visit was already untenable, but now the offer must be officially rescinded
Four men who are allegedly members of National Action have been arrested on terror offences
Bernard Kenny, the pensioner who attempted to stop Thomas Mair from killing the MP, is being hailed as a hero
Alex confronted our host over comments made on James Whale's show last week
Sheryll Murray used PMQs to ask Theresa May what could be done to stop intimidation of MPs
It has been a year since MP Jo Cox was murdered by Thomas Mair
The MP for Batley and Spen was killed by Thomas Mair almost a year ago - and her widower is organising an event to mark the occasion
There have been a couple of attacks - all of which received widespread coverage - which the White House didn't include on their list
The MP for Leeds West is the co-chair of a commission that the former MP for Batley and Spen had been working on launching prior to her death
The former UKIP leader tweeted the Berlin market attack would be 'Merkel's legacy', and then claimed Jo Cox's widower supported extremism when he called him out
The Jo Cox charity single has been released today, and all proceeds will go towards starting The Jo Cox Foundation
Lee Scott, the former MP for Ilford North, spoke to Sam Delaney about the increased security measures MPs are implementing to protect their safety
Matthew Collins, the author of Hate: My Life in the British Far Right, spoke to Julia Hartley-Brewer about the man who killed Jo Cox
Thomas Mair was sentenced to life imprisonment after he was found guilty of murdering MP Jo Cox
Thomas Mair has been found guilty of murdering MP Jo Cox and jailed for life
The man accused of murdering Labour MP Jo Cox has opted not to give evidence in his defence
MP Jo Cox was covering her face with her hands when she was shot in the head in Birstall, West Yorkshire, a court has heard
The trial for the murder of Jo Cox has begun, with the prosecutor claiming the attack was politically or ideological motivated and pre-planned
53-year-old Thomas Mair will appear at the court to face his charges today
New Batley and Spen MP Tracy Brabin heckled by far-right supporters during victory speech
The former MP for Batley and Spen died in June after being attacked outside her constituency office
Batley and Spen MP was murdered in the days leading up to the UK's vote on the European Union
Labour and Conservative parties announced they wouldn't put anyone up to run for the seat in Batley and Spen
The chairman of The Royal Society of St. George believes Bernard Kenny, who intervened in the attack of Jo Cox, should be honoured
The MP for Ilford warns of the hate people in the public eye can receive
Stephen Timms MP insisted changes made to security after Jo Cox's death don't deter the public from visiting their MPs
After the death of Jo Cox, the former MP and author calls for people to treat MPs with more respect
The Labour MP for Brent North speaks about MP Jo Cox
Will Geddes insisted upon a review to protect the safety of people in the public eye
The MP for Port Talbot was a personal friend of Jo Cox, who was shot and killed today in West Yorkshire
Rev. Paul Knight called for stronger belief in the goodness in people's hearts in the wake of the shooting
The MP for Batley and Spen was killed in an attack in West Yorkshire today
Labour MP Jo Cox was attacked and has passed away in hospital