In the call, Clinton says that Delaney has "proved he knows what it takes to create jobs and grow this economy. You can count on John Delaney to stand up for the middle class and for our Democratic values."
Clinton has been a frequent presence in the race. He endorsed Delaney before the April primary and he headlined a fundraiser for him last month. Delaney is running against Republican incumbent Rep. Roscoe G. Bartlett in a district that was redrawn by Democrats in Annapolis last year.
The election is Tuesday.