All kinds of things. An romney's horse failed to add advance. The end of that olympic dream may clear the way for another dream that takes shape. Now that rafalka's bid is in the mirror, it's "your... See More
All kinds of things. An romney's horse failed to add advance. The end of that olympic dream may clear the way for another dream that takes shape. Now that rafalka's bid is in the mirror, it's "your voice your vote." Reporter: What does a dancing horse have to do with mitt romney's announcement of a running mate. This is ann romney's horse that just competed but failed to advance for the final round for the olympics. That means mrs. Romney is clear to return to the u.S. And to be by her husband as another dance, the v.P. Dance, enters its final stage. We can now start crossing names offer the list. Start with the just-announced head liners to speak at the republican convention. Jeb bush. Condoleezza rice, and new mexico governor gomez. And while they are certainly no longer on the v.P. List, romney himself said he might be trying to trick us. You don't think we we would from time to time throw people off do you? Reporter: That would be time to announce his running mate or give those on the short list one last tryout. Among those joining us, ohio senator portman and senator marco rubio. That leaves one chance for a speculation, including an online report that president obama had said he's convinced romney will pick cia director david petraeus. I can say with absolute confidence that such an assertion has never been uttered by the president. Reporter: Trust us, it's not going to be petraeus. The final list, the solid and safe choices of rob portman and former governor tim pawlenty or the bolder and riskier choices of paul ryan or marco rubio. There's just not much time left, george. This is toda the republican convention started in less than three weeks. AND THE 29th, THAT'S THE DAY That's reserved for the vice presidential candidate to speak. So we know romney has to make his decision by then. But we suspect it's going to be quite a few days before that. But there may be time for a few more wild rumors. Jon karl, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.