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In her two years as governor of Alaska, and especially in the four months since her son was born with Down syndrome, Sarah Palin has been portrayed as the very model of a working mother: She answers her BlackBerry while pumping breast milk for her infant; keeps a playpen by her desk; and manages a state while cooking caribou hot dogs for her family. But some people, looking at that tableau, wonder whether it is possible to perform that juggling act on the highest wire of all, a heartbeat away from the presidency. Those questions came into higher relief on Monday as Gov. Palin, just days after she was introduced as the Republican vice-presidential pick, disclosed that her 17-year-old daughter, Bristol, is about five months pregnant. She said Bristol plans to keep the baby and marry the father.