The trick is to put the actual input in your own block. Try the following:
<div class="form-group has-feedback">
<div class="input-group">
<div style="position:relative">
<input name="emailAddress" type="text" class="form-control" value="">
<span class="glyphicon glyphicon-remove form-control-feedback"></span>
</div>
<span class="input-group-btn">
<button id="button-send" type="submit" class="btn btn-primary">Go!</button>
</span>
</div>
</div>
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