Newsweek reports:
Palin would certainly light up the base at the convention—her 2008 vice-presidential acceptance speech was, in terms of partisan enthusiasm, the high-water mark of the McCain campaign—but a jolt of Palin at Romney’s convention seems most unlikely. The Romney campaign prides itself on a slavish adherence to script, and Palin cannot be trusted to avoid the impulse to go rogue. That is why, perhaps, the Romney campaign has not asked Palin to speak at the convention nor contacted her about even attending the party’s marquee event in Tampa. Queries to the Romney camp about any possible Palin role at the convention meet with a stony silence. Palin does not seem surprised. “What can I say?” she responded in an email from Alaska, when asked by Newsweek about the convention, just before heading to Michigan to deliver an Obama-thumping speech. “I’m sure I’m not the only one accepting consequences for calling out both sides of the aisle for spending too much money, putting us on the road to bankruptcy, and engaging in crony capitalism.”
Rick Santorum is also reportedly not speaking at the convention.