CNN reported that, "An envelope that tested positive for the deadly poison ricin was intercepted Tuesday afternoon at the U.S. Capitol's off-site mail facility in Washington, congressional and law enforcement sources tell CNN. Senate Majority Leader Harry Reid said he was told the letter was addressed to the office of Sen. Roger Wicker, R-Mississippi. After the envelope tested positive in a first routine test, it was retested two more times, each time coming up positive, the law enforcement source said. The package was then sent to a Maryland lab for further testing."
At first it might seem odd that the junior senator from the deep red state of Mississippi was targeted, but Wicker was one of 16 Senate Republicans who joined with all but two members of the Democratic caucus in voting to advance the enhanced background checks bill in the Senate. CNN also reports that a suspect has been identified in the case, and there could be any number of reasons why Wicker was targeted, but it is not an illogical assumption that the poison letter could be tied to the vote.
Comment: Remember folks, this and Jonestown is where the 'cult-mass suicide' meme comes from - psychopathic government massacres in both instances.