Nothing says the entire vote must be done in one day, just that the electors shall be appointed on that day. That is a law made by congress which can be changed at anytime, not a requirement of the Constitution, which only demands that the electors, not the electorate, all vote on the same day.
And, jveritas, by requiring the military to vote in one day you would be disenfranchising large numbers of them. Military operations cannot and will not come to a halt all over the world for one day so military members can vote. Otherwise, we are asking to be attacked on that day.
I find it revealing that nobody here complained during the last two elections when the Pubbies beat the pants off the Dems in early voting. Run a candidate who actually has some core conservative values and the willingness to articulate them and we’ll win, every time. Run Mr. Lib Lite Wishy Washy and lose, every time. The failure is wholly and completely that of the Republican Party and McCain, not the voting system.
I think you'd have to look at the posts around the last election. I always vote on election day and have always considered such travesties as "motor-voter" and unrestricted early voting to be bad things. Probably said so several times over the last 10 years or so that I've been posting on this site, but I have neither the time, nor inclination to look for it.
The only exceptions I'd make is for military voting and perhaps voting at embassies, because at both locations you could have trained people to maintain a chain of custody to prevent fraud.
I'd also strongly recommend that anyone who hasn't voted in the last two election cycles be automatically purged from the rolls.