captioning sponsored by macneil/lehrer productions lehrer: good evening, i m jim lehrer. on the newshour this tuesday, the lead story, president obama s afghanistan troops and strategy decision. gwen ifill talks to two members of congress who met with the president today. and judy woodruff, mark shields and david brooks preview tonight s announcement speech. then, after the other news of the day, fred de sam lazaro reports from australia on the impact of a record drought on food production. you can see the sharp contrast between the 2 soils. this one s got some future and this one s got no future. lehrer: and jeffrey brown has a conversation with historian gordon wood about the early days of the american republic. major funding for the newshour with jim lehrer is provided by: what the world needs now is energy. the energy to get the economy humming again. the energy to tackle challenges like climate change. what is that energy came from an energy company? everyday, c