You may not want to go to congressman until you make sure that its pending name checks. The easiest way is to call TSC and choose the option "separated family applications" to talk to TSC agent directly and ask the agent if the name check is pending and if so, since when.
Since your application date is much after the current processing date, you will not have any sympathy from any departmant authorities including your congressman.
Opportunity to escalate the situation thru congressman and writing/communicating directly to directors of departments at TSC, FBI should be used intelligently and only in case of known problems/delays. Otherwise, there is a danger of missing the opportunity you might get legitably.
In my case, I knew from the bginning (Sep 2002) , that my case got wrongfully approved right away. But I had to suck it up until Dec 2004 as thats when the processing date crossed my application date. I tried numerous times and they turned it down bcos of the processing date.
My only advise is to be careful when escalting any issue. Once they use the processing date timing on you, you might not be in there good looks.
Good luck