"Wall Street is suffering in the throes of depression right now," says Jeffrey Kleintop, chief market strategist at LPL Financial. He tells John Wordock there's a lot to worry about - low consumer confidence, low volume, downside selling, discouraging news from tech. Kleintop says this is going to be a long, hot summer for investors as they deal with the Four E's: earnings, the economy, energy and the election.