The weak economy and the battle over health care are taking their toll on President Barack Obama and Congress's popularity.

Obama's approval rating is down to 46 percent in Gallup's latest tracking poll, the lowest of his presidency. His disapproval rating stands at 48 percent.

The ratings come during a week when the White House and Democratic congressional leaders are looking to convince House Democrats to support health care reform.

Obama is tied with Republican Mitt Romney in a new survey from a polling company that works with the Democratic Party on presidential polling. In that same poll, Obama leads former Arkansas Gov. Mike Huckabee by only two points at 46 to 44 percent.

A new Gallup Poll shows Congress is not doing well either. From among Americans polled, only 16 percent approve of the job Congress is doing, while 80 percent disapprove.