Former safe coaltion seats that are now marginal.

A marginal seat by definition is a seat won by less than 6%. Barring any major scandals a lot of these seats will fall at the next election when the Labor party increases it's vote via the power of incumbency.

Seat name - previous margin- new margin.
Aston - 13.15% - 5.05%
Bowman - 8.9% - 0.04%
Canning - 9.54% - 5.58%
Casey - 11.35% - 5.93%
Cowper - 6.75% - 1.23%
Dickson - 8.89% - 0.13%
Dunkley - 9.38% - 4.04%
Fairfax - 12.31% - 3.01%
Fisher - 10.98% - 3.10%
Forrest - 10.45% - 5.83%
Gilmore - 9.41% - 4.07%
Gippsland - 7.70% - 5.91%
Greenway - 11.35% - 4.50%
Grey - 13.82% - 4.43%
Herbert - 6.24% - 0.21%
Hinkler - 8.34% - 1.69%
Hughes - 8.55% - 2.16%
Hume - 12.84% - 4.16%
Kalgoorlie - 6.30% - 2.58%
Macarthur - 11.15% - 0.72%
North Sydney - 10.04% - 5.38%
Paterson - 6.32% - 1.51%
Ryan - 10.42% - 3.82%
Sturt - 6.8% - 0.94%