The House Judiciary Committee was also lied to and they don't seem happy about that either. Most politicians also understand the potential for abuse inherent in these programs. That helps too.
It is hard to say if we'll see meaningful reform come from this, but it is encouraging see the reaction so far. The hearings in the House this week are going to make for very interesting TV too.
The executive branch/defense establishment blatantly lying to Congress without repercussion would amount to a coup of sorts in the precedent it sets.
I think most representatives could give two shits about the American people and their privacy, but threaten their turf and their power and it's game on.