Something interesting is happen in Nevada this election. I have a hard time believing that it is this pro-Republican.
Heck is about as good a candidate they could have found, barring Sandoval entering and making it Safe R.
Outside of Sandoval he is the only candidate who has any appeal in Clark County, he is also helped by the fact that Cortez Masto, while not a bad candidate, is fairly anonymous
Plus it's not like Democrats had many better options
Ross Miller and Dina Titus were really the only two other heavy hitters they had
Cortez Masto also, while AG, was under fire for indicting then-LG Brian Krolicki, then dropping the indictment (which was purely partisan motivated) since he had done no wrongdoing. Ross lost the AG race in 2014, though the wave really hurt him. Titus also lost to Heck in 2010, and would not have been that much better. The Democratic bench in Nevada is pretty weak, for now.