So the weight of the political landscape decreases by one milliband as Dave heads off to Tracey Island to head up International Rescue (encouraged no doubt by the fact that there was little evidence of sibling rivalry between the brothers).
But joking apart, this must be a loss for the Labour party as the-leader-in-waiting, and good news for the Conservatives, a great joy for the Trade Unions as Ed will be even more firmly in their pockets
It will trigger a by-election, although as South Shields is one of the safest Labour seats, the outcome is not in much doubt (although the swings for and against the other parties will be interesting). .
David Milliband has an interesting voting record though, even though he hasn't been seen much in front line politics of late.
http://www.theyworkforyou.com/mp/dav.../south_shields