BOSTON— U.S. Sen. John Kerry, in some of his most pointed public comments yet about November's presidential election, invoked Martin Luther King Jr.'s legacy on Monday as he criticized President Bush and decried reports of voter disenfranchisement on election day. Kerry, Bush's Democratic challenger, spoke at Boston's annual Martin Luther King Day Breakfast. He reiterated that he decided not to challenge the election results, but went on to say that "thousands of people were suppressed in the effort to vote." "Voting machines were distributed in uneven ways. In Democratic districts, it took people four, five, eleven hours to vote, while...