Former congressman announces for president

The presidential field just grew by one.

Former US Representative Bob Barr of Georgia announced that he will run as a Libertarian this year. He first must win that party's nomination at its national convention that begins May 22.

A conservative former Republican, Barr could end up hurting presumptive GOP nominee John McCain -- just as some Democrats fear that Ralph Nader's independent candidacy could bleed votes from the Democratic nominee.

Barr, 59, who served in Congress from 1995 to 2003, helped lead Bill Clinton's impeachment. He quit the Republican Party two years ago, saying he had grown disillusioned with its failure to shrink government and its willingness to scale back civil liberties in fighting terrorism.

In a news conference, Barr said "only a fool" would specify a date and timetable for withdrawal from Iraq. But he said it's "extremely important" and in the best interest of national defense to draw down dramatically the US troop presence in Iraq and decrease the military and political footprint in Iraq.