Your browser does not support the <code>iframe</code> HTML tag. Try viewing this in a modern browser like Chrome, Safari, Firefox or Internet Explorer 9 or later. SPRINGFIELD — Caretakers of Abraham Lincoln’s tomb are on the defensive over an unflattering critique in National Geographic magazine and looming budget cuts that could threaten management of the historic site, even as they commemorate the 150th anniversary of the Civil War-era president’s assassination. For the state that calls …