Want to know the reason? It's because of the NSA/CIA/FBI having extensive records on EVERYBODY who uses electronic media.
They have everything.....the names of your girlfriends, the names of your prostitutes, the names of your shady accountants, the names of your crooked lawyers, your income tax cheating, the names of every porn film you've watched, the names of every shady website you've ever visited, the names of your family's convicted felons, recordings of your phone sex with your wives, access to your bank accounts, the blood pressure unit you bought on your credit card, all your diseases and disabilities, your secret stint at the Betty Ford Clinic, and access to anything with a password.....AND YOU HAVE THE GALL TO ASK WHY NO ONE WANTS TO STICK HIS HEAD OUT?
Put two and two together for once, huh? Sheesh. No one can best a Stasi-like system, NOBODY.
Get it?
There are many members of Congress who lead exemplary lives and have no skeletons in their closets to be blackmailed with.