Democratic strategist James Carville and Democratic National Committee vice chair David Hogg sparred over the best strategy to help the party win elections in a heated debate on Wednesday.Tensions between the two began weeks earlier when Hogg announced plans to spend $20 million through his political organization Leaders We Deserve to primary-challenge older Democrats in blue districts. Democrats were split on this strategy, with some anonymous committee members calling out Hogg for spending money on Democratic primaries over beating Republicans. Carville attacked Hogg's plan as the "most insane thing" he'd ever heard and questioned whether he was breaching his "fiduciary...