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The Super PAC, Right to Rise, that is backing Bush, has also had its sights set on Rubio, sending trackers to two of his events (one in Cedar Falls, Iowa, the other in Las Vegas).

When asked to confirm that the tracker was theirs, spokesman Paul Lindsay told ABC: \"And we thought Donald Trump was thin-skinned. It's a wonder why Marco Rubio has such a problem with transparency.”

In Iowa, Rubio shrugged off the trackers.

“Doesn’t matter. I’m campaigning, and when I’m campaigning, either somebody else tracks it or you guys get it on video; people will know what we’re saying,” he said.

Still, both times, the Rubio campaign opted to kick the trackers out.

For now, Bush still uses his own record as his best defense, trying to stave off what could be an inevitability, having to go head-to-head with the candidate whose career he helped to shape.

\"Look, I’m a friend of Marco’s. I’m a huge fan of his,\" Bush told reporters last week in New Hampshire. \"I got to work with him, he got to work with me. That’s a better way of saying it. When I was governor, he was an incredible talent, but we’re in times right now that I think requires leadership and that’s my case, and I’m going to stick with it. \"

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