New Mexico governor Bill Richardson, a former presidential candidate, plans to endorse Democratic Senator Barack Obama for president.
Officials with Obama's campaign tell news agencies that the two men will appear together at a rally Friday in Portland, Oregon.
In a statement obtained by the Associated Press, Richardson calls Obama a "one of a kind" leader who can bring the country together.
Richardson, the nation's only Hispanic governor, was energy secretary under former President Bill Clinton and was also an ambassador to the United Nations.
Recent opinion polls indicate that Hispanics have tended to support Obama's Democratic rival, Senator Hillary Clinton.
Obama currently leads among delegates selected at Democratic primaries and caucuses. The next major primary is to take place in Pennsylvania next month - April 22.
Some information for this report was provided by AP and Reuters.
