Index: wp-content/themes/twentyeleven/editor-style.css
===================================================================
--- wp-content/themes/twentyeleven/editor-style.css	(revision 17979)
+++ wp-content/themes/twentyeleven/editor-style.css	(working copy)
@@ -6,8 +6,9 @@
 * {
 	color: #333;
 	font: 15px "Helvetica Neue", Helvetica, Arial, sans-serif;
-	font-weight: 300;
+	font-weight: inherit;
 	line-height: 1.625;
+	font-style: inherit;
 }
 body {
 	color: #333;