If you think the Republicans are going to win a Nevada Senate seat and the Democrats are going to win back AL-GOV, I assume you're going with the time line of the Democrats finally becoming populist left, and the Republicans set to becoming right-libertarian.
This would all depend on who the incumbent president is. I don't see this being divisive on the Democratic side, but there would probably be a factional war on the Republican side between social conservatives (Labrador) and the libertarians (Amash). I think Sasse would win the Republican primary, yet I have no idea for the Democrats.
The social conservatives, libertarians, and neoconservatives are obviously battling for the Tea Party's support. Tisei and Washington, the latter of whom is a real person, are competing for two constituencies: Tisei for that of reforming the right, and Washington for that of softening and rebranding the right. Really, I suspect whichever of the two wins New Hampshire would win the nomination, as the other would likely drop out, assuming they would get the second slot, the Secretary of the Treasury position, or be allowed to suggest Cabinet members. Amash, Sasse, Labrador, Love, Innis, and Greitens are all obviously competing over the same constituency. The only question is which can stand out, which can organize the best, and which can speak the best.
For the Democrats, Kennedy Jr. is standing for the moderates, while Buttigieg and Bustos are also aiming to win over the establishment and moderates. Jealous, Ellison, Teachout, de Blasio, and Shuler are clearly competing for the progressives and outsider vote. Shuler, to me, stands out above the others.