The last Democratic presidential primaries take place Tuesday, but an obscure panel of 30 party insiders now finds itself in the strongest position to determine whether the long nominating process will come to a smooth conclusion.Meeting at a Washington hotel Saturday, the party's Rules and Bylaws Committee will attempt to settle a lingering dispute about whether delegates from Michigan and Florida should be seated at the party's convention in August.Both campaigns and thousands of voters have been lobbying the committee members, who are used to working in anonymity. E-mail messages are flooding in. The 500 tickets set aside for spectators were snapped up within three minutes on the Internet.At stake are the 368 delegates from Michigan and Florida, who were disqualified because those states held their primaries in January, earlier than allowed by party rules. Under the outcome Hillary Rodham Clinton has called for in recent weeks, she would pick up 111 more delegates than Barack Obama. That would narrow his lead in the delegate count and might position Clinton to argue to the party's superdelegates that they should throw the nomination to her.But there is little support on the committee for giving the New York senator everything she wants. That leaves the panel with a second challenge: bringing Clinton, Obama and Democratic officials together in an agreement that unites the party and keeps bruised feelings to a minimum.