This guy is against the rights of people to keep and bare arms as witnessed by Judge Garland wanting to reconsider the ruling D.C. vs Heller
Voting to rehear a case doesn't necessarily mean that he wanted to change the ruling. A conservative judge (A. Raymond Randolph) also voted to rehear the case, and he probably was in favor of the result of the case. The DC Circuit Court's ruling was a huge deal, and it's common for the entire court to hear rehear major cases in en banc.
It's fine if people oppose Garland for his views or judgments, but Garland's vote to rehear a case is not evidence of his views one way or the other, no matter what Carrie Severino says.