Georgia Republicans have the stronger ground game: 1,000 field operatives and thousands of volunteers have already canvassed nearly a million voters. Only now have Democrats started to canvas in person. Moreover, the number of requests for mail-in ballots is down one-third from the general election, and a greater proportion of them have come from Republicans, according to GOP data analysts…

Republicans are mounting an industrial-size ballot-integrity effort to reassure the grassroots that their votes will make a difference. A battalion of GOP lawyers are focused on every aspect of the election, from newly registered voters and cameras monitoring ballot drop boxes to matching signatures on requests for mail-in ballots and monitoring precincts and tabulation rooms.

The president’s trip to Georgia Saturday will be key. Rather than simply vent his grievances, Mr. Trump must remind supporters that no matter how frustrated they are with November’s results, they must turn out for Mr. Perdue and Ms. Loeffler. Otherwise, a Democratic Senate would undo many of the president’s accomplishments, advance a very liberal agenda, and spend years investigating the Trump administration’s every action with endless subpoenas.