To defeat the Republican, you must become the Republican... [View all]
I don't mean becoming a racist, sexist, xenophobic bible-thumper; I mean applying cold-hearted, emotionless decision-making as to which candidates you'll support financially. Think about the Koch Brothers. Did they target Bernies Sanders and Elizabeth Warren in past elections? No, they targeted vulnerable Democrats like Heidi Heitkamp and Claire McCaskill in Republican-friendly States. They didn't focus on people they hated; they focus on people they could defeat.
As we look forward to the 2020 Senate races, we must apply the same dispassionate logic. Don't focus on Mitch McConnell and Lindsey Graham: defeating them would be emotionally satisfying but the odds are still incredibly long (yes McGrath and Harrison outraged them in the 1st Quarter of 2020, but they still have WAY more money and political support in place). Instead, focus on the vulnerable Republicans: McSally, Gardner, Collins, Tillis. THEN, if you still have financial resources, look at the second tier pickup opportunities: Loeffler, Ernst and Kobach. Don't play the long shots.