Index: wp-admin/press-this.php
===================================================================
--- wp-admin/press-this.php	(revision 17525)
+++ wp-admin/press-this.php	(working copy)
@@ -624,7 +624,7 @@
 					if ( $selection )
 						echo wp_richedit_pre($selection);
 					if ( $url ) {
-						echo '<p>';
+						echo '<p class="press-this-via">';
 						if ( $selection )
 							_e('via ');
 						printf( "<a href='%s'>%s</a>.</p>", esc_url( $url ), esc_html( $title ) );