Late last week, the transition team confirmed that President-Elect Obama's mother-in-law will be moving to Washington with the first family, at least temporarily. Marian Robinson will be the latest in a line of presidential in-laws who, for good or ill, lived under the same roof as the president. Here are four stories that confirm the old truism: While America can choose its president, the president can't choose his in-laws.
1. Ulysses S. Grant and "˜The Colonel'
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