I haven't seen ANY politician coming out and saying they support encryption. As soon as the Apple and FBI case came out, you saw both republicans and democrats divided even on this fairly simple case:
Democratic congressman Mike Honda of California has come down firmly on the side of the tech company, saying that the DoJ sought to increase its authority “with the tyrannical impulses that were the very reason our country was created”.
By contrast, Democratic Senator Dianne Feinstein of California called on Apple to cooperate immediately following the “terrorist attack in my state” and threatened legislation, though she said she “hope[d] it would not be necessary”.
https://www.theguardian.com/technology/2016/feb/29/apple-fbi...
If the tech industry wants to push the needle forward, then they have to get in the game. As of 2016. I haven't seen many people in the industry rushing to try and educate the politicians in Washington. Sure, they like to write articles and stand on the side of Apple and other companies, but that doesn't count for much in my book.
http://www.wired.com/2015/07/google-facebook-amazon-lobbying...
http://www.fool.com/investing/general/2016/02/09/which-tech-...
And this database would suggest some tech companies fall into the 5th highest spending industry: https://www.opensecrets.org/lobby/top.php?showYear=2015&inde...
So, a better question is, why, despite these efforts are we still seeing this? A few reasons, I'd guess...
1) Lobbying efforts by other industries and groups (law enforcement has a vested interest here, for example)
2) A tendency to wanting to look tough on crime and terrorism, especially going into an election year. Moderation and wise restraint are always a tough sell in politics
3) The Unbearable Asymmetry of Bullshit - politics edition. http://quillette.com/2016/02/15/the-unbearable-asymmetry-of-...
4) A propensity on the part of many in government to want to hold more power (closely related to point 2, but more self-serving).