Mitt Romney still hasn't invited Sarah Palin to the GOP convention, and that could spell trouble for the Republican nominee.

The Daily Beast reports the Romney campaign has not asked Palin to speak at the convention. Her appearance would be welcomed by many attendees, but Romney isn't having any of it.

The Romney camp will not comment on Palin, or on plans for the convention, but one adviser associated with the campaign suggested that Palin would be prohibited from speaking at the Republican convention by her contract with Fox News. “It’s true I’m prohibited from doing some things,” Palin says, “but this is the first I’ve heard anyone suggest that as an excuse, er, reason to stay away from engaging in the presidential race. I’m quite confident Fox’s top brass would never strip anyone of their First Amendment rights in this regard.” (Fox says her contract would not prohibit speaking at the convention if she sought permission.)

Palin is keeping the dates open in late August, just in case. In any event, she says, she plans to be politically active between now and November, starting with a Michigan Tea Party appearance, sponsored by Americans for Prosperity. “No matter the Romney campaign strategy,” she says, “I intend to do all I can to join others in motivating the grassroots made up of independents and constitutional conservatives who can replace Barack Obama at the ballot box.”

Palin’s admirers—and they are many, judging by Facebook and Twitter metrics, where her numbers are far greater than Romney’s—still hope for a rapprochement. “Palin is the female Ronald Reagan of our time,” says Kremer of the Tea Party Express. “There’s no one that excites the base, and energizes the base, the way that Sarah Palin does. There’s just not.”