I don't like it much, either. But I am not ready to impeach the President over it. It looks like what was done was legal, because it was done for the purposes of gathering foreign intelligence. So the legal issue is settled, IMHO.
However, as a political issue, I would favor a politician who supported clear limitations in this regard. If a Presidential candidate were to come out foursquare for an executive order stating clearly what the government may and may not do in this area that would be more protective of individual privacy, I would be more inclined to support that candidate.
To me, ultimately, it is a political question.
The terrorists would be grateful for the info too, of course.