NOTE: For an updated version (with better color-coding) please see here and for the full calendars in each of these election years, please see the left sidebar.
This weekend I put together a few maps for a job talk and class lecture I'm doing later this week on frontloading and thought I'd share them with everyone. The slideshow below has the states color-coded based on the month in which their delegate selection event occurred in the elections from 1976-2008. You'll see that some states are divided with two separate colors in some years. That reflects the different dates on which Democratic and Republican states held (in most cases) their respective caucuses. Though there are states that had primaries for one party and caucuses for the other. In those instances where the state is divided, the left half color corresponds to the Democratic contest date and the right color, the Republicans'.
When I get a chance, I'll post these in one of the sidebars so that they'll constantly be there for easy access.
New Jersey in 2012
Out of Committee and On to the Floor: Back to May for the Arkansas Presidential Primary
Illinois in 2012