A trio of Iowa officials is criticizing the Democratic National Committee for instituting polling and fundraising thresholds to participate in the presidential debates. They say the thresholds are artificial and they are winnowing the field of candidates and usurping the job of Iowa caucus-goers. In a conference call with reporters today, Iowa Attorney General Tom Miller and Iowa DNC member Jan Bauer said most Iowans are not tuning in to the Democratic presidential debates and have not yet made