German Social Democratic head Sigmar GabrielTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoMartin Brandt04/02/2011April 2, 2011German Social Democratic Party Sigmar Gabriel is optimistic about the SPD's future following a string of state election successes, and lays out his party's priorities on the economy, environment and taxes.https://p.dw.com/p/REr5Advertisement