Resolving a token conflict in antlr
===

I have a Token OR:'OR'; that I use for evaluating a boolean expression( a==b OR a==c) I have another rule for parsing state abbreviation that are in a char list AZ,AK,OR,GA...
What I am finding is that antlr has error on the state list thinking OR should be an or token rather then 

stateName 	
	: CHAR CHAR (','|EOF) ->^(STATE CHAR+)
	;	

how would I go about resolving this ambiguity?