The drive to keep the UK in the European Union will be the Yes campaign after accusations of negativity dogged the pro-Union parties during last year's independence vote.
A leader's resignation usually follows a heavy defeat for a political party.
Former first minister Jack McConnell has blamed the "carnage" in Scottish Labour on Ed Miliband's decision to work hand-in-hand with the Tories during the independence referendum campaign and his treatment of Holyrood as a "branch office".
Losing it left, right, and centre
IT didn't take long to turn a world upside down.