Licoln suspended the writ of Habeas Corpus from 1861-1862, of which then Maryland Justice Tanney ruled against as unconstitutional. However, Licoln waved such criticism aside as the words of a Southern gentleman and continued. Roughly 13,000+ people were arrested in something resembling martial law in the US.
I'll leave debate as to the justice or merit of Licoln's actions to historians, but I will delicately point out that THE WAR ON TERRORISM IS IN NO WAY SIMILAR TO THE @#%#@ CIVIL WAR! The idea that the "war" on terror is in anyway related to an actual war with a defined opposition is ridiculous. We in America truly have suffered little to make so careless a comparisson. We do not have an economy ravaged, the future of the nation in doubt, or even any true threat to the stability of this government itself (outside our own decisions, of course).
If you honestly think that the "war" on terror or any other emotion is comprable to the revolutionary or civil wars, then you are truly fortunate to be so distanced from the real tragedy of warfare.
Vale,
Theus