function index() {
	var out;
	var id;
	var i;
	out = {};
	for ( i = 0; i < FILES.length; i++ ) {
		// Extract the President's name from the filename:
		id = FILES[ i ].match( RE )[ 2 ];

		// Convert the name from snakecase:
		id = unsnakecase( id );

		if ( hasOwnProp( out, id ) ) {
			out[ id ].push( i );
		} else {
			out[ id ] = [ i ];
		}
	}
	return out;
}
Generates an index for querying the SOTU database by President name.

@private
@returns {Object} database index