SO fiddle
Test Fiddle mainly for SO Questions
by Nick Craver
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div id="radio">
<input type="radio" id="radio1" name="radio" /><label for="radio1">A</label>
<input type="radio" id="radio2" name="radio" checked="checked" /><label for="radio2">Choice 2 - long long</label>
<input type="radio" id="radio3" name="radio" /><label for="radio3">Choice 3</label>
</div>
JavaScript
$(document).ready(function () {
$("#radio").buttonset().find('label').width(200);
});