WASHINGTON (AP) - A Democratic aide says the White House and congressional Republicans have reached an agreement to avert the so-called fiscal cliff. The measure would extend Bush-era tax cuts for family incomes below $450,000 and briefly avert across-the-board spending cuts set to strike the Pentagon and domestic agencies this week. Vice President Joe Biden was set to sell the agreement to Senate Democrats at a meeting at the Capitol on Monday night. The aide required anonymity because he wasn't authorized to speak publicly.