 Pari gbolohun yii: Ni idibo ipinle 2008, Müller kuna lati dibo si Landtag; pelu eyi, o tun yan gẹgẹbi Minisita ti Ipinle fun Federal ati European Affairs nipasẹ Minisita-Aare Horst Seehofer ti a yan tuntun ni ile-iṣẹ ti ijọba apapo rẹ, ti o ni awọn ọmọ ẹgbẹ ti CSU ati alabaṣiṣẹpọ apapo kekere wọn, Ẹgbẹ Free Democratic Party FDP. Lẹyìn àbájáde ìwádìí náà : 2013 ipinle idibo, eyi ti yori si Müller ká idibo si awọn Landtag ati ohun pipe opolopo fun awọn CSU, o ti a yan si awọn 2nd Seehofer Igbimo bi Minisita ti Labor ati Social Affairs, Family ati Integration, rọpo ẹlẹgbẹ ẹgbẹ ọmọ Christine Harderthauer. 