In the 1946 midterms, the unpopular and error-prone rookie president Harry Truman, buffeted by a different set of economic dislocations, watched his party lose both chambers of Congress (including 54 seats in the House) to a G.O.P. that then moved steadily to the right in its determination to cut government spending and rip down the New Deal safety net. Two years after this Democratic wipeout, despite a hostile press and a grievously divided party, Truman roared back, in part by daring the Republican Congress to enact its reactionary plans. He won against all odds, as David McCullough writes in ‘Truman,’ because ‘there was something in the American character that responded to a fighter.’