Judicial Crisis Network (JCN), a conservative political advocacy group, has already spent almost $1.1 million on more than 2,121 television ad spots since February to support the confirmation of U.S. Supreme Court nominee Neil Gorsuch, according to numbers compiled by Bloomberg BNA from Kantar/CMAG data.

JCN’s spending easily dwarfs the $17,000 spent by People for the American Way (PFAW)—the progressive group started by television and film producer Norman Lear—against the nominee.

Typically these ads from JCN and PFAW urge the...