(Image Credit: Brian Cahn/ZUMA Press/Corbis)

The success of Ann Romney's dressage horse, Rafalca, in the London Olympics could determine when Mitt Romney announces his running mate.

As Mitt Romney prepares to head back to the states Tuesday evening after several days abroad, the frenzied speculation about who he will choose to be his running mate will reignite after a momentary pause.

But not so fast, veepstakes trackers.

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One person who isn't heading back to the United States quite yet is Ann Romney, who will return to England from Poland Tuesday to see her horse compete Aug. 2 and 3. Depending on how the horse performs, he could show again Aug. 8 and 9, Ann Romney's spokeswoman, Sarah Haley, said.

That means Ann Romney might not be back in the United States for at least another week.

The candidate is unlikely to announce his running mate - unarguably one of the most important moments of his campaign - without his wife, whom he often refers to as his "sweetheart," by his side.