Free speech rights were not violated

http://www.nationalreview.com/articles/331314/when-political-speech-comes-under-fire-john-fund

John Fund claims that in Ohio free speech rights are violated because liberal groups pressured a private ad company to take down signs that the liberal groups find offensive. If the state or local government had forced the removal of the signs, Fund would have a point, but the liberal groups excercised their rights to free speech and pressured Clear Channel to remove its signs. Clear Channel is weak for having done so, but it's not a violation of free speech. Groups and individuals who support the signs should have applied as much pressure to keep the signs up, but they didn't.