Please see:

New Features Added to Congress.gov Based On Your Feedback

From the above blog post, note in particular the intent of the Law Librarians of Congress:

“Since the unveiling of Congress.gov in September of 2012, we have been constantly adding new features with each release, and many of the features in this release are based directly on your feedback.

Accessibility
We want to make Congress.gov more accessible…. [Emphasis added]”

Cross-posted at Law Library Blog.