After two consecutive elections in which Democratic candidates failed to turn clear economic advantages into electoral victory, a debate is raging over what the Democrats should donow. The narrow, red state-blue state argument between chest-beating populists and soulless centrists offers the answer to neither the country's economic future nor the political future of the Democrats. In "The Pro-Growth Progressive, " President Clinton's longest-serving national economic advisor, Gene Sperling, argues that the best economic strategy for our nation -- and the best strategy for progressives whether...