Wulff 's candidacy for President of Germany in the 2010 presidential election was formally confirmed by Angela Merkel , Guido Westerwelle and Horst Seehofer . They are the heads of the CDU , FDP and CSU parties . Wulff 's candidacy for President of Germany in the 2010 presidential election was formally confirmed by Angela Merkel , Guido Westerwelle and Horst Seehofer , the heads of the CDU , FDP and CSU parties , during the evening of 2010 .