The 1948 Election was not unlike what America faces in 2012--a do-nothing Congress against a president with low approval ratings and an economy with problems (higher prices then, unemployment today) and trouble spots overseas.
Rather than play an accommodating "Associate Professor of America" as Barack Obama did in 2010 and most of 2011, the underdog candidate for the 1948 election, Harry Truman fought back and put the onus on the "80th Do-Nothing" Republican dominated Congress, which had pushed against increases in minimum wages, labor rights and a national health care program.
The result was a complete turnaround in voters perceptions of President Truman and his party. This is a good lesson for all Democrats running for office. A discouraged enlightened electorate does little but to encourage its adversaries.
Can history repeat itself? Let's just say this is how a Democratic President running for election SHOULD sound like.