Wordpress - allow an anonymous user to submit posts?

Following this guide, I am trying to create my own anonymous user submitted post plugin.

Below is my code so far:

function suq_form_shortcode() {

    if (
        isset($_POST['suq_form_create_quote_submitted'])
        && wp_verify_nonce($_POST['suq_form_create_quote_submitted'],'suq_form_create_quote')
    ) {

        $suq_quote_title = trim($_POST['suq_quote_title']);
        $suq_quote_author = trim($_POST['suq_quote_author']);
        $suq_quote_text = trim($_POST['suq_quote_text']);

        if ($suq_quote_author != '' && $suq_quote_text != '') {

            $quote_data = array(
                'post_title' => $suq_quote_title,
                'post_content' => $suq_quote_text,
                'post_status' => 'pending',
                'post_author' => $suq_quote_author,
                'post_type' => 'post'
            );

            if($quote_id = wp_insert_post($quote_data)){

              echo '<p>Quote created and awaiting moderation!</p>';

            }

        } else { // author or text field is empty

            echo '<p>Quote NOT saved! Who said it? and Quote must not be empty.</p>';

        }
    }

    echo suq_get_create_quote_form($suq_quote_author, $suq_quote_text, $suq_quote_category);

}

function suq_get_create_quote_form ($suq_quote_author = '', $suq_quote_text = '', $suq_quote_category = 0) {

    $out .= '<form id="create_quote_form" method="post" action="">';

    $out .= wp_nonce_field('suq_form_create_quote', 'suq_form_create_quote_submitted');

    $out .= '<label for="suq_quote_author">Name</label><br/>';
    $out .= '<input type="text" id="suq_quote_author" name="suq_quote_author" value="' . $suq_quote_author . '"/><br/>';


    $out .= '<label for="suq_quote_title">Title</label><br/>';
    $out .= '<input type="text" id="suq_quote_title" name="suq_quote_title" value=""/><br/>';

    $out .= '<label for="suq_quote_text">Quote</label><br/>';
    $out .= '<textarea id="suq_quote_text" name="suq_quote_text" />' . $suq_quote_text . '</textarea><br/><br/>';
    $out .= '<input type="submit" id="suq_submit" name="suq_submit" value="Submit Quote For Publication">';

    $out .= '</form>';

    return $out;
}

It works fine as I can see the submitted posts in my admin area, but it one of info is missing which is the author name that user submitted.

Any ideas how I can show the author name that provided by the user themselves?

I have passed the author name to WP:

'post_author' => $suq_quote_author,

But WP does not seem to pick it up...

via Chebli Mohamed