Yea and he got off because his buddy flipped on him and they successfully used the argument "you can't believe anything that guy says he's a convicted pedophile."
that said burgerstan gets exactly the kind of representation it deserves... not what it needs (rather the opposite) but what it deserves, not justifying it but Trump's bringing all the true blue-blooded Real Americans™ into office, bald eagles and the founding fathers cry
They were going to bring charges but the primary witness was the victim, who is or was a sex worker. Since the defense would just say, "You can't trust a prostitute over a US representative.", they decided not to proceed.
Perhaps I missed some details, but I believe the argument was a bit different (but also probably included what you said). They wanted to use the other convicted pedophile, his buddy, but they feared a jury wouldn't trust a convicted pedophile. I think these were both effectively speculation though since the feds never formally acknowledged much of it. We saw the evidence and we knew they were pursuing charges... and then it went poof with little reason why