Leaders in Washington agreed late Monday to an extension through September of the 2008 farm bill, a move that could end talk of doubling milk prices. Senate Agriculture Committee Chairman Debbie Stabenow, D-Mich., and House Agriculture Chairman Frank Lucas, R-Okla., announced Sunday they had agreed on a last-minute extension for the farm bill that will replace dairy programs that expire at midnight today. Expiration of those dairy programs would mean higher milk prices at the grocery store within just a few weeks.