When does campaigning become stalking?: Democrats putting videos of Republican Congressional candidates' homes online

From Politico:

. . . While most serious campaigns on both sides use campaign trackers — staffers whose job is to record on video every public appearance and statement by an opponent — House Democrats are taking it to another level. They’re now recording video of the homes of GOP congressmen and candidates and posting the raw footage on the Internet for all to see. . . .Wisconsin GOP Rep. Reid Ribble, who said he’s also been followed by a cameraman when shopping for groceries, said the home videos cross a line. . . .Republicans whose homes have been videotaped say they understand that politics is a contact sport and that every public utterance they make is fair game. But, they argue, filming a home — and posting actual addresses— ought to be off-limits, if only out of respect for their families and neighbors. . . .Trackers assigned to California GOP candidate Ricky Gill, a highly touted challenger to Democratic Rep. Jerry McNerney, pushed the edge of the envelope even further.  In May, a clip of Gill’s parents’ Lodi, Calif., mansion appeared online. . . .Democrats, on the other hand, insist the videos are fair game — and are unapologetic about the hardball tactics. . . .