Here's what I got when I clicked http://caucus99percent.com/content/whos-online

PDOException: SQLSTATE[HY000] [1203] User already has more than 'max_user_connections' active connections in lock_may_be_available() (line 167 of /public_html/includes/lock.inc).

Too many people logged on is a good problem to have! This setting may be adjusted by your service host, or perhaps by tweaking the values in the SQL table yourself. Don't try that at home unless you already know a lot about MYSQL.