I ended up just editing the source code in ‘mailchimp_widget.php’ as follows:
<div id="mc_signup">
<form method="post" action="#mc_signup" id="mc_signup_form">
<input type="hidden" id="mc_submit_type" name="mc_submit_type" value="html" />
<input type="hidden" name="mcsf_action" value="mc_submit_signup_form" />
<input type="hidden" name="mc_mv_XXXXX" id="mc_mv_XXXXX" value="XXXXX"/>
<input type="hidden" name="mc_mv_XXXXX" id="mc_mv_XXXXX" value="XXXXX"/>
<?php wp_nonce_field('mc_submit_signup_form', '_mc_submit_signup_form_nonce', false); ?>
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Where the X’s are, I used the proper list fields and the value I wanted passed in.
Hope that helps.
-Mac
