WASHINGTON — Chief Justice John Roberts swore in Barack Obama as president Tuesday in the first of what could be many important interactions for the two men of differing politics who rose quickly to power. The encounter was briefly awkward after Obama stepped on Roberts' opening lines from the 35-word constitutionally prescribed oath of office. The chief justice then wandered into a verbal detour of his own.
By tradition, the presidential oath is administered by the chief justice, and in Roberts'...
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