New Mexico Gov. Bill Richardson intends to take the first step toward the Democratic presidential nomination, several officials with knowledge of his plans said Friday.

The former congressman, U.N. ambassador and Energy Department secretary is hoping his extensive resume will fuel an insurgent campaign to become the nation's first Hispanic president.

He plans to announce on Sunday that he will soon file the papers to create a presidential exploratory committee, the officials said. The governor is scheduled to appear on ABC's "This Week."

Richardson's office did not immediately return a call for comment.

Richardson brings a wealth of experience in international affairs that has extended even into his governorship of a small but politically important swing state. He has hosted talks on North Korea's nuclear program in New Mexico and most recently traveled to Sudan to meet with the country's president to press him for an end to the bloodshed in Darfur.

Despite having one of the most varied and impressive portfolios in politics, Richardson enters the race as an underdog. Polling in early voting states shows him ranking near the bottom in a very crowded Democratic field led by Sens. Hillary Rodham Clinton of New York and Barack Obama of Illinois, and 2004 vice presidential nominee John Edwards.

Richardson does not have the national fundraising network of some of his rivals in what is bound to be a very expensive race. And he'll have to spend the next two months concentrating on a legislative session in Santa Fe instead of hitting the campaign trail.

But Richardson's decision to form an exploratory committee will allow him to begin raising money and putting together his campaign organization. A decision on whether to formally enter the race is expected in the spring.