Here is what Lincoln did not do and Musharraf did. He did not suspend the Constitution, remove the Chief Justice, impose martial law upon the entire country, incarcerate dozens of lawyers, arrest leaders of the opposition party and human rights advocates or ban political demonstrations.Did he not suspend provisions of the Constitution? Ignore the Chief Justice? Suspend habeas corpus throughout the north? Arrest leaders of the opposition party and place them in prison incommunicado? To the Republican in the street, opposition to the war was treason and opposition to the incumbent's war policies were treason; hence 1861's Summer of Rage in which mobs were unleashed against the Republican Party's political opponents. To the man in the street, Musharraf included, Foner is splitting ridiculously fine hairs.
It's one thing to argue steps were necessary another to say they never happened.