Clark Endorses ClintonSenator Hillary Rodham Clinton and Gen. Wesley K. Clark appeared together at the Clinton Global Initiative Summit in 2005. (Photo: Handout/Getty Images)

In a conference call plagued with technical problems today, retired Gen. Wesley K. Clark endorsed Senator Hillary Rodham Clinton’s candidacy for president.

“She’s a remarkable person. She’s had incredible experiences; she’s smart; she’s done her homework,” he said.

General Clark, who served as NATO commander in her husband’s administration, ran an unsuccessful bid for the Democratic nomination in 2004. Speculation surrounded his intentions for 2008: He vowed not to make 2004’s mistake of announcing too late (a mistake some fear Fred D. Thompson has repeated on the G.O.P. side), but then never revealed his intentions one way or the other, passively removing himself from the running — until now.

Nonetheless, General Clark ran as a credible critic of the war in 2004, and he remains a popular figure in the anti-Iraq war movement, serving on the board of advisers of the VoteVets group.

Asked what role he will play in the campaign, General Clark said, “I haven’t considered anything like that.”

For her part, Mrs. Clinton spent as much time plugging General Clark’s new book, “A Time to Lead,” as he did singing her praises.

“I know you’re going to be busy with your book tour,” she said to him. Perhaps he’ll hit some bookstores in Iowa and New Hampshire.