Place the chicken breasts on the bottom of your slow cooker.
Pour the tomatoes and salsa over that.
Layer on the beans.
And finally, the corn.
Cover securely with lid.
Set to low temp. Cook on low for 5-7 hours, or until the chicken easily falls apart when the pot is stirred.
When done, shred the chicken simply by stirring everything. If that doesn't do an effective job for you, use either forks, or an electric mixer set to its lowest speed so as not to crush the beans.
Serve on its own, with corn chips, over rice, or even as a burrito filling.
