Senate GOP letter calls for blocking most billsUpdated: Nov 30, 2010 11:01 PM EST By DAVID ESPO AP Special Correspondent WASHINGTON (AP) - Senate Republicans intend to block action on virtually all Democratic-backed legislation unrelated to tax cuts and government spending in the current postelection session of Congress, officials said Tuesday, adding that the leadership has quietly collected signatures on a letter pledging to carry out the strategy. If carried out, it would doom Democratic-backed attempts to end the Pentagon's practice of discharging openly gay members of the military service and give legal status to young illegal immigrants who join...