As a Head of Government he has such right to oppose some candidatures. Fractions and HoGs choosing candidates for Commission President are two separate things - for example Viktor Orban from Hungary is also opposing Juncker candidature but his party is in EPP. For you as radical left supporter that should be better when those parties from Denmark and Finland will be part of eurorealist/euroconservative ECR than theoretical Le Pen fraction.  

_________________________________________________________________________________ Christus vincit, Christus regnat, Christus imperat