Illusionist David Copperfield arrives for the 16th annual Keep Memory Alive "Power of Love Gala" and 70th birthday celebration for Muhammad Ali at the MGM Grand Garden Arena in Las Vegas in February. (Photo by REUTERS/Steve Marcus.)

In the robocall, Copperfield relays that he has worked in “some of the most amazing places in the world,” including the MGM Grand in Las Vegas.

“This is a destination resort casino, like the one proposed by Question 7 and one that could appear if you approve Question 7,” Copperfield says in a call coordinated by a ballot-issue committee promoting the expansion plan.

MGM Resorts is angling to build a Las Vegas-style casino at National Harbor in Prince George’s County if the ballot measure passes. The proposal would also allow table games, such as black jack and roulette, at the five previously authorized slots sites in Maryland.

Copperfield touts the promise of proponents that the ballot measure would lead to thousands of good jobs and hundreds of millions of dollars for schools — figures that other side disputes.

“I want to assure you this is no illusion, and it’s why I’m asking you to vote for Question 7,” Copperfield says.

Proponents of same-sex marriage have enlisted a array of actors, athletes and musicians, primarily to help with fundraising for their campaign. Rock singer Melissa Etheridge is among the latest.

Opponents are also getting in the game, with a planned video featuring Matt Birk, the center for the Baltimore Ravens.