Democrats are preparing next year to lift the "Don't Ask, Don't Tell" ban on gays in the military, an uneasy culture-war compromise instituted under the last Democratic administration, should Sen. Barack Obama win the presidency. Rep. Ellen Tauscher, the Walnut Creek Democrat, said a hearing Wednesday by a House Armed Services subcommittee is aimed at educating Congress and the public in preparation for a full-scale push to end the policy, first imposed in 1993 under President Bill Clinton, in the next Congress. By then, Democrats expect to have won the White House and to have expanded their House and Senate...