I am not from Vegas, but here in Tampa we have a very similar newspaper dynamic, with two major newspapers, one right-wing, one liberal.  I doubt there is a single politically somewhat involved person who does NOT know that the St. Petersburg Times tilts strongly to the left, and the Tampa Tribune tilts strongly to the right.   I assume the same is true for most Las Vegas residents in regards to the political tilt of the LV Journal vs. the LV Sun.