Tim Johnson reports:
Dozens of lawmakers in Congress are using tracking tools on their campaign websites to collect personal information about online visitors, including some legislators who have lambasted Facebook and other social media companies for employing similar methods.
The revelations underscore how critical internet tracking has become to politicians who seek information on voters in their districts to target them with advertising.
One senator removed tracking tools from his campaign website after his office was contacted by McClatchy, and another lawmaker pledged to put up a privacy alert about the tracking.
Many others did not respond to queries about their use.
Read more on McClatchyDC.