NASHVILLE, Tenn. — Former Vice President Kamala Harris made a surprise appearance on Tuesday with the Democratic candidate in a closely watched Tennessee special election for Congress, marking the first time since she left office that she has returned to the campaign trail for another candidate.

The race for the open House seat is in a district that President Donald Trump won by more than 20 percentage points last year, and is seen as a long shot for Democrats. But Harris’ decision to campaign is the latest sign that the Dec. 2 election is being seriously contested. National party leaders now see the contest as an important test of the political environment before next year’s midterm elections.

Early voting has already begun in the race between state Rep. Aftyn Behn, the Democrat, and Ma

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