JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<div class='container'>
  <div class='row'>
    <div class='span2'>
      <div class='well'>
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      </div>
    </div>
    <div class='span2'>
      <div class='well'>
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        XXXX
      </div>
    </div>
    <div class='span2'>
      <div class='well'>
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      </div>
    </div>
  </div>
</div>

JavaScript

$('.well, .alert').height(function () {
        var h = _.max($(this).closest('.row').find('.well, .alert'), function (elem, index, list) {
            return $(elem).height();
        });
        return $(h).height();
    });