Democratic Gov. Tim Walz of Minnesota has a problem with telling the truth. That fact was highlighted during Tuesday night’s vice presidential debate and again the next day. He’s apparently been telling a lie for years about being in China in June 1989, when the communist government cracked down on pro-democracy demonstrators in Tiananmen Square in Beijing. During the debate, CBS News moderator Margaret Brennan raised the issue with Walz, saying, “You said you were in Hong Kong during the deadly Tiananmen Square protest in the spring of 1989. But Minnesota Public Radio and other media outlets …