Several states are holding critical primaries that will set the stage for critical November elections for the House and Senate and a number of governor’s races. Who will emerge as the nominees for the GOP in critical Senate races in California and Nevada? Can Blanche Lincoln hang on to the Democratic nomination in Arkansas? Which House races should we watch carefully? Are any incumbents in danger in their own primaries? And how is the fight between the Tea Party and the GOP establishment likely to impact some of these races? We ask Reid Wilson of National Journal’s Hotline-On Call.