The real left wing threat to President isn’t a primary challenge from someone in his own party like Bernie Sanders, Russ Feingold or Dennis Kucinich. The real threat comes from Leftists who will support Ron Paul if the latter has a chance of winning the GOP nomination.
Indeed, it may be why more attacks are coming Paul’s way like today at the Washington Monthly or at AlterNet or from Steve Kornacki at Salon or from Kevin Drum at Mother Jones. Apparently they don’t want Leftists or checking Paul out and perhaps liking what they at least have in common. Maybe they don’t want them voting for Paul in open primaries (of which their are 18 in which independents and or Democrats can vote in for a grand total of 874 delegates) to help Paul win the GOP nomination which would really put President Obama in a tight spot being the pro-war, pro-big bank candidate (and probably getting the endorsement of Rush Limbaugh on top of that). No, they don’t want this to happen.