Zelizer : Obama delivers first State of the Union of second term . He says it 's an opportunity for president to sketch a broad vision for America . Speech comes at a time of continuing economic troubles in U.S , he says . Julian Zelizer : Obama can follow in the footsteps of LBJ and LBJ .
Julian Zelizer : Obama delivers first State of the Union of second term . He says it 's an opportunity for president to sketch a broad vision for U.S . Speech comes at a time of continuing economic troubles in America , he says . Zelizer : Obama can follow in the footsteps of FDR and LBJ .