Expect NV-3 to be changed to "Lean Dem" in the near future.
Tarkanian has serious flaws from what I'm reading.
Tarkanian does have serious flaws, he has run for office and lost 4 times prior to now, he's on his 5th run for office. But Rosen is also untested as a candidate (besides winning her primary overwhelmingly, I suppose, but I suspect that's more because she was Reid's handpicked candidate in a low turnout election). This race is a tossup for now, but if Rosen proves to be a good candidate, I expect the race to lean D.
In the end, I think Rosen will win because she has a weak opponent, Tump is at the top of the ticket, and it's a presidential year with higher turnout. But I wouldn't completely discount Tarkanian at this point.
If Republicans really wanted to lock up this seat, they should've nominated Michael Roberson. GOP voters voted against their most electable candidate in my opinion.