Gravel ditches Democrats

Barack Obama and Hillary Clinton are now officially the only active Democratic presidential hopefuls.

Mike Gravel, the former Alaska senator, told supporters today that he plans to join the Libertarian Party "because the Democratic Party no longer represents my vision for our great country."

He had long been an afterthought in the race, and had not won enough votes to get included in debates, but had still been an official candidate. Gravel's main cause is to take power away from Washington and give lawmaking power to local voters. He was also a vocal opponent of the Iraq war.