Jeremy Corbin's supporters have claimed the left-winger has the momentum in the race to become Labour's next leader after he ended two days of campaigning in Scotland with a packed rally in Glasgow.

More than 700 people turned out at the city's Old Fruitmarket venue to hear the surprise frontrunner in the leadership contest.

They cheered him to the rafters after a build-up which included a rendition of The Red Flag and other socialist anthems.

Introducing him, ex-MP Katy Clark hit back at opponents who have claimed the Islington North MP would consign Labour to years of opposition.

"He's the most electable candidate we have," she said.

Earlier in, a sign of the pace gathering behind his campaign, Mr Corbyn was backed by MSP Cara Hilton, who had previously voiced support for Andy Burnham.

She said she backed him after Labour abstained in a Commons vote on welfare reform last month.

She said: “I was outraged by that. We need to take a firm view and stand up for the people Labour was formed to represent.

“People want change.

"They want a leader of the  Labour Party who says what they mean. Jeremy would be a straight-talking leader.”

She added: "It is too early to say whether he will win but he has the momentum on his side.

"I think we are seeing something quite exciting in politics."

Bob Thomson, a former chairman of the Scottish Labour Party who became a prominent Yes campaigner in last year’s referendum, also said he was backing Mr Corbyn.

In a letter to The Herald, he said the Islington MP represented “real Labour”.

His backing added weight to claims from inside the Corbyn camp that the Islington North MP is winning widespread support from Yes voters within Labour.

Mr Corbyn received a rapturous reception in Glasgow, where demand to hear him speak had forced organisers to switch the event to a bigger venue.

The rally followed a lunchtime event in Edinburgh where hundreds packed into the EICC, filling an overspill room as well as the main hall.

At both he repeated his call to end austerity, renationalise the railways, end privatisation and scrap Britain's nuclear deterrent.

He used the Glasgow rally to launch a 10 point plan, Standing to Deliver, which also promised tougher action to tackle climate change.

He said: "These things are not easy, these things are possible and they can be achieved but they are not going to be achieved by politicians in isolation handing down policies from secluded drawing rooms in secluded and comfortable parts of this country.

"They are going to be achieved by ordinary people coming together, in the spirit of those who founded our movement... all of us in other words."

Mr Corbyn used the rally in Edinburgh to hit back "smears" by his opponents, saying people were "totally and absolutely and completely turned off" by personal attacks.

He added: "I'm not really very bothered about what anybody says about anybody in our campaign, including me".

He also called for a cross-party effort to challenge the Government's welfare cuts.