Voter ID requirement for Federal elections?

This is a topic that is near and dear to the hearts of many Wisconsin Republicans. The Senate immigration bill may or may not include a requirement for voter ID in Federal elections:

An amendment to the immigration bill being debated in the U.S. Senate would make it mandatory for all voters to present photo identification before casting ballots in a federal election by Jan. 1, 2008.

Senate Majority Whip Mitch McConnell, R-Ky., introduced the amendment (S.A. 4021) to The Comprehensive Immigration Reform Act of 2006 (S.B. 2611).

Calls to McConnell's press secretary were not immediately returned, however, a staffer in his office said the vote on the amendment had not yet been scheduled.

This is not what I would consider an ideal solution to Wisconsin's dangerously loose voting laws, especially if it is an amendment to a bad immigration bill. It should be interesting to watch this as it develops, though.