Democratic mayor hails "a shared vision, and a shared strategy" for tackling inequality.
The former PM seizes the initiative with a timetable for further devolution to Scotland.
Labour leader will tell the TUC general council: "What working people have in common matters more than any division of creed, race or region. Or even nation."
With Labour planning to amend the bill, Clegg's party could still be caught between two stools.
Fighting against Scottish independence, the former PM makes the case for social justice far better now than when he was in office.
Ukip could prove to be of merely short-term electoral advantage to Ed Miliband; Labour may be in power after 2015, but its principles will not.
Some in Labour are in danger of giving the appearance that they believe Cameron’s MPs will do a better job of finishing him off than they can.
Ukip could cost Labour several seats next year.
Farage needs to explain why he could prevent the referendum he has always wanted.
There is certainly space in British politics for a party beyond the edge of Labour, but a left-wing alternative has yet to emerge.