(Undated) — Tea party-backed candidates came up empty in Republican primaries Tuesday. … Senate minority leader Mitch McConnell easily knocked down tea party challenger Matt Bevin in the Kentucky primary. And Idaho GOP Congressman Mike Simpson ran up more than 60-percent of the vote in turning back a challenger who drew support from anti-tax groups. In Georgia’s five-candidate Senate primary, two tea party candidates ran far behind businessman David Perdue and Congressman Jack Kingston. Perdue and Kingston will meet in a runoff for the GOP nomination. What does this all tell us? 