Dec 28 (Reuters) - A U.S. judge on Tuesday allowed a criminal case relating to the deadly Jan. 6 Capitol attack to move forward, declining to dismiss charges against four members of the far-right Proud Boys group. In a written ruling, U.S. District Judge Timothy Kelly rejected arguments by the four Proud Boys defendants that obstruction charges should be thrown out. The defendants — Ethan Nordean, Joseph Biggs, Zachary Rehl, and Charles Donohoe — have been charged with violating a federal law that makes it a felony to obstruct an official government proceeding, among other charges. That obstruction charge has...