meta_query dates from an array

I have the below query which isn't returning anything. The query is meant to look for the date (2014-03-01) that is in the array, which it is.

Any ideas? Or would I need to use a custom SQL query?

// the income_dates array looks like this
// a:3:{i:0;s:10:"2014-02-01";i:1;s:10:"2014-03-01";i:2;s:10:"2014-03-29";}

$args = array(
    'post_type' => 'income',
    'meta_query' => array( 
        array(
            'key' => 'income_dates',
            'value' => "2014-02-01",
            'type'  => 'date',
            'compare' => 'IN'
        ),
    )
);