WASHINGTON (AP) — President Barack Obama’s proposal to limit itemized tax deductions for high earners is running into opposition from key Democrats in Congress who worry that charities and the housing market would be hurt. Senate Finance Committee Chairman Max Baucus questioned Wednesday whether the proposal was viable, a day after his House counterpart also expressed reservations. Treasury Secretary Timothy Geithner said tax increases on families making more than $250,000 a year are necessary to make a down payment on health care reform and to limit future budget deficits. But, he said, he was willing to work with lawmakers on proposals they objected to.