Republicans have to defend 23 seats. The RATs only 12. I might add Arizona Governor Ducey did not help by nominating McSally who already lost her first Senate election.
I might add if Republicans lose two seats control of the senate will be in name only because POS Romney and Collins of Maine will effectively become the Senate.
Then, since you live in Arizona, you should devote your time, talent and treasure to ensuring a McSally win!
I trust you WILL do your part?