Support for the war in Afghanistan has ebbed to a new low in ABC News/Washington Post polls, with concerns over strategy and broad doubts about the reliability of the Afghan government leaving Americans sharply divided on where to go from here.Just 44 percent now say the war in Afghanistan has been worth fighting, the fewest in a question dating to early 2007. Fifty-two percent instead say the war has not been worth it, up 13 points from its low last December - still well below Iraq levels, but majority negative nonetheless.