Public support for the U.S. war effort in Afghanistan has fallen to an all-time low, with only 30 percent of respondents saying it has been worth fighting…

For Romney’s campaign, the slip in Republican support for the war could pose political difficulties, placing him outside the majority view of his party. For the first time, more Republicans and GOP-leaning independents oppose the war than support it, with 55 percent saying it has not been worth the costs.

The findings come a month after a U.S. soldier is alleged to have killed 17 Afghan civilians in what witnesses said was a house-to-house rampage. The soldier, Staff Sgt. Robert Bales, had deployed three times to Iraq before arriving in Afghanistan in December.