Romney endorses McCain as Clinton criticises Obama

Boston: Former Republican presidential hopeful Mitt Romney endorsed John McCain on Thursday and urged Republicans to unite behind him.

"This is a man capable of leading our country at a dangerous hour," Romney said with McCain at his side. Romney dropped out of the race last week.

In the Democratic race, Senator Hillary Clinton scored a much-needed victory in New Mexico and accused rival Barack Obama of lacking substance and experience.

"That's the difference between me and my opponent. My opponent makes speeches. I offer solutions," Clinton said, brandishing a pair of boxing gloves given to her in Ohio.

Clinton intensified her attack as she was forced to scramble for sweeping victories in Ohio and Texas on March 4 and in Pennsylvania on April 22.