PRINCETON, NJ -- President Barack Obama averaged 46% job approval the week of Feb. 28-March 6, his lowest weekly average since mid-December. Obama's weekly approval rating had steadily improved from mid-December to late January, peaking at 50% during the final two weeks in January, before dropping below that mark in February. Trend, November 2010-March 2011: Do you approve or disapprove of the way Barack Obama is handling his job as president? Obama is now essentially back to where he was in the immediate post-election phase of 2010. The decline could be due to a number of issues the administration is...