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In page 1866 National Union Convention:

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In the end, the convention was not successful in unifying the country behind President Johnson. He launched a speaking tour (known as the "Swing Around the Circle") hoping to regain public and political support. On this speaking tour, Johnson at times attacked his Republican opponents with crude and abusive language, and on several occasions appeared to have had too much to drink. Ultimately, the tour was a disaster for Johnson, emboldening the Congress to override him and to impeach him in 1868.[3]