With Boston police warning rally-goers to “leave the sticks and stones at home,” the city grabbed the day’s cable news coverage for what was a largely peaceful, if uneasy, stand-off between the so-called Free Speech Rally and the vastly larger-in-number anti-racist counter-protesters at Boston Common. Despite some tense moments of riot-geared police swarming potential clashes – one such incident got simultaneous coverage on CNN, MSNBC and the Fox New Channel – the…