This new feature lists marathons (and halfs) in nearby states on consecutive days.  If you are looking to do 2 marathons in one weekend in different states, this page will help you find your marathons.  It displays one month at a time, but is smart enough to know when the consecutive days are in different months, and will list a March 1st race when you select February, or a February 28th race when you select March.

 

Enjoy!