03/28/2008 02:45 am ET Updated May 25, 2011

Super Tuesday Viewer's Guide

Poll closings:

8pm ET: Alabama, Connecticut, Delaware, Illinois, Massachusetts, Missouri, New Jersey, Oklahoma, Tennessee

8:30 pm ET: Arkansas

9 pm ET: Kansas (Dems only), Arizona, Colorado, Minnesota, New Mexico (Dems only), New York

10 pm ET: Idaho (Dems only), Montana (GOP only), North Dakota, Utah

11 pm ET: California

1:30 am ET: Alaska

It's not the Super Bowl of politics, but it could be the playoffs. In any event, tonight's television broadcasts of results from the parties' presidential-nominating contests mark the closest thing to a national primary day in history.

Never have so many states -- 24 of them -- held primaries and caucuses on a single day, including California, the biggest convention-delegate trophy by far. There is suspense: By night's end, a clear Democratic favorite could emerge in the nip-and-tuck battle between Hillary Clinton and Barack Obama, and John McCain could be the apparent Republican nominee.

Read more here.