WASHINGTON — A sense of euphoria, and newfound influence, oozed at celebrations in Washington, D.C., on Monday, as the MAGA movement’s front lines rang in the second inauguration of President Donald Trump.

At Butterworth’s, a restaurant on Capitol Hill, a sea of red MAGA hats packed in tight to drink in Trump’s swearing-in ceremony. Behind the bar, former Breitbart editor Raheem Kassam, an investor in the new spot that has served as a sort of Trump-y outpost since opening late last year, helped dish out cocktails to the attendees — a mix of Republican twenty-somethings angling for jobs in the administration, incoming officials, and fellows at Trump-aligned think tanks hosting the invite-only soiree: American Moment, Center for Renewing America, and the Conservative Partnership Institute.