ReactJs - uncheck checkbox from postalJs subscription

I have a component I would like to uncheck from a postal.js subscription. Using my code below the checkbox is always checked.

I am storing the value in state and setting it in ComponentDidMount. Can anyone tell me how I can uncheck it once I receive the subscription:

var postal = require('postal');
var contactChannel = postal.channel("contact");

var SelectAll = React.createClass({

getInitialState: function() {
    return {
        selected:false
    };
},

handler: function(e) {

    var updatedContacts = [],
        contacts = this.props.data.contacts,
        topic = 'selectAll',
        checked = false,
        channel = 'contact';

    if (e.target.checked === true){
        checked = true;
    }

    contactChannel.publish({
        channel: channel,
        topic: topic,
        data: {
            selectAll: checked
        }});

},

render: function() {
    var isSelected = this.state.selected;

    return (
        <div className="contact-selector">
            <input type="checkbox" checked={isSelected}
                onChange={this.handler} ref="checkAll" />
        </div>
    );
},

setChecked: function(){
    this.setState({ selected: true });
},

componentDidMount: function() {

    contactChannel.subscribe("deselectedContact", function (data) {
        this.setChecked();

    });
}

});

module.exports = SelectAll;