PRINCETON, NJ -- President Barack Obama's job approval is the worst of his presidency to date, with 46% of Americans approving and 48% disapproving of the job he is doing as president in the latest Gallup Daily three-day average.

Obama's approval rating has hovered around 50% since November, but in the last two days has declined to the point that slightly more Americans now disapprove than approve of his performance in office.

The new low ratings come during a week in which the White House and Democratic congressional leaders are working to convince wavering House Democrats to support healthcare reform, which they hope to pass using a series of parliamentary maneuvers in the House of Representatives and Senate....