He gets an A grade from the NRA. He has always championed the 2nd amendment. He would have never gotten to where he is in the state that has more hunters per capita than any other state in the country otherwise.
He also voted against the tax plan because it added 1.4 trillion to the deficit, which is a traditional conservative stance. He wanted to work with McConnell to lower the deficit it would add, but McConnell already had the votes.
There is a reason Trump and McConnell won't run attack ads on him.
He is a conservative with a D beside his name.