It is more an exercise in exasperation.
It seems that the only way to get some of those old geezers to retire is to vote someone in from the opposing party.
In Roberts’ case, he is similar to the FORMER Senator Blanche Lincoln. She actually resided in Virginia (IIRC) and tried to get reelected from Arkansas. Arkansans sent her packing.
Roberts is more conservative than Boozman and most of the 2010 Senators who got elected. Mike Lee is probably the only one who is more conservative.