Labor provisions could be tucked into ag legislation. WASHINGTON -- Farmers, immigrants and their Capitol Hill allies are hoping to graft an agricultural guest-worker plan onto the multibillion-dollar farm bill.Sen. Dianne Feinstein, D-Calif., hasn't yet decided whether to push the controversial guest-worker measure when the Senate considers the farm bill next week. Behind the scenes, though, proponents are counting votes and lobbying furiously."Now we're getting down to the nitty-gritty, where real hard decisions have to be made," said Dan Haley, a lobbyist for the California Strawberry Commission and other farm groups. "We can't wait around."Tactically, this is a very tough...