Just hours after explosions rocked the Boston Marathon on Monday, Chris Matthews speculated, "Normally domestic terrorists, people, tend to be on the far right." He then reconsidered and suggested, "...That’s not a good category, just extremists, let’s call them that." [See video below. MP3 audio here.] During live coverage, the Hardball host highlighted a possible explosion at John F. Kennedy's presidential library and thought this could be a personal attack on the Democratic Party: "...But going after the Kennedy Library, not something at Bunker Hill, not something from the Freedom Trail or anything that kind of historic, but a modern...