WASHINGTON – The Democratic Party and 18 senators are objecting to a broadcasting company's plan to air on 62 TV stations a critical documentary about John Kerry's anti-war activities after he returned home from Vietnam three decades ago. Sinclair Broadcast Group has asked its television stations, many of them in competitive states in the presidential election, to pre-empt regular programming to run the documentary as part of an hourlong program two weeks before the Nov. 2 election. Based near Baltimore, the company owns or manages affiliates of major broadcast networks in several states, including Ohio, Florida and Pennsylvania. Mark Hyman,...