The spot shows a clip of Chavez saying that if he were American, “I’d vote for Obama.” The Venezuelan leader did say that in September, when he also called Obama “a good guy.”

Obama’s campaign on Thursday said the move unduly rewards the Venezuelan leader. Venezuela has had tense relations with the U.S. government for years, even though the U.S. is a top buyer of its oil.

“Mitt Romney continues to play Hugo Chavez’s game, giving Chavez the attention he thrives on and that he doesn’t deserve,” said Dan Restrepo, a national security adviser to the Obama campaign. “Keeping America safe and advancing U.S. interests require the kind of leadership President Obama has provided, not Romney’s bluster.”

The ad, first reported by The Miami Herald, was airing on three Spanish-language TV stations in heavily Hispanic Miami.

The ad features a similar clip featuring Castro’s niece, Mariela, who has no official link to the Cuban government. She’s a noted advocate of gay rights and has praised Obama’s stand in support of same sex marriage.

The ad represents an effort to court Cuban Americans in Miami, many of whom have supported Republican presidential candidates in past elections. Romney campaigned Wednesday in Florida.