This is the (extraordinarily obvious) point the Wall Street Journal missed when it chimed in yesterday in support of the Senator. As the Journal wrote:

Her answer was met with jeers, but what Mrs. Clinton was daring to tell her left-wing audience is that lobbyists are an essential means by which average Americans transmit their political concerns to Washington, and in turn hold their elected Representatives accountable. Not everyone in America can afford to trek to D.C., or has the clout to demand an audience with a Senator. Lobbyists represent the collective voice of groups with shared ideals, whether they be gun owners, union workers, corporate employees or the pro-choice movement.

Just the sort of reasoning that makes that page so famous: Look, lawyers represent their clients before a judge. Does it follow from that that judges must be free to take money from lawyers? Even just to redecorate their office?