Anti-war Democrats in region want speedy withdrawal from Afghanistan.

Byline: Bill Lambrecht

June 22--Some Democrats are nervous about Afghanistan given the war's loss of public support.

WASHINGTON -- President Barack Obama's task in his speech tonight will be persuading a skeptical electorate why the U.S. military continues to wage war in Afghanistan.

That might be a challenge not just with voters but with members of Congress from the president's own party.

Since the president dispatched 33,000 "surge" troops to Afghanistan last year, Osama bin Laden has been killed, the nerve center of al-Qaida attacks has shifted away from the region and the U.S. economy has struggled under growing debt.

Obama is …