Unfortunately, anything that happens will result in the White House being blamed for Orchestrating events to influence polls. The Democrats and media do that so President must be doing it as well is their reasoning.
Personal comment. Money donated to Republican 527 organizations would stimulate more results if donors ask for them. These 527's have the money to make these things happen, while the RNC and state organizations are limited because of McCain/Finegold and various state laws. Also, personal appeals to various celebrities would help, as long as there is NO official Republican footprint on the suggestions or requests.
You have a point, although I do think the President could legitimately ask Angelina Jolie to the White House. After all, he did meet with Bono, and Bono did a pretty fair job of standing up for the President's efforts in Africa.