OAKLAND, Calif. - Democratic presidential contender Barack Obama said Wednesday it's critical for Pakistan to be a constructive ally in fighting al-Qaida, one week after threatening military action to hunt down terrorists if President Pervez Musharraf doesn't act.

Obama and his spokesman offered measured criticism of the Bush administration's actions and policies on Pakistan. The candidate twice declined an opportunity to explain the difference between his proposals and the White House's, but expressed sympathy for Musharraf, who faces a growing militant backlash in his Muslim nation.

"President Musharraf has a very difficult job, and it is important that we are a constructive ally with them in dealing with al-Qaida," the Illinois senator said.

Obama did not repeat the most incendiary line from his foreign policy speech last Wednesday, when he promised: "If we have actionable intelligence about high-value terrorist targets and President Musharraf won't act, we will."

That pledge set off ripples of resentment in the relationship between Washington and Islamabad, prompting Pakistani officials to warn against U.S. incursions into their country.

Tariq Azim, Pakistan's minister of state for information, said talk from the United States about the possibility of U.S. military action against al-Qaida in Pakistan "has started alarm bells ringing and has upset the Pakistani public."

Azim cited Obama as an example of someone who had made such comments and said Obama's recent remarks were one reason the government was debating whether to declare a state of emergency.