Thom said today, and has said previously, that the Constitution mandates Tuesday voting. This is not true. The Constitution mentions days of the week only twice, neither in connection with elections. What it says about dates of elections is (Article II, Section 1):
"The Congress may determine the Time of chusing the Electors [for president], and the Day on which they shall give their Votes; which Day shall be the same throughout the United States."
(Although I remember that Maine used to have its presidential election in September, instead of November.)