Obama will step up in the House of Representatives at 9pm (0200 GMT), wielding the issue of economic inequality as a cudgel against Republicans holding his second term hostage.
White House aides say Obama will be "ambitious" in the speech to lawmakers, cabinet members, Supreme Court justices, military top brass and millions of television viewers.
But beyond the spin -- and despite signs of faster growth in a still wounded economy -- the president has little to cheer going into his sixth year in office.
Sixty-eight per cent said the country was either stagnant or worse off since Obama moved into the White House in 2009.
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But he will seize a chance tomorrow to recapture momentum and to chart the early going for mid-term elections in November, in which his Democrats are in danger of losing the Senate.
Republican control of both chambers on Capitol Hill would mean a grim final two years in the White House for a president who came to power vowing to change the world.
To fight back, Obama will mine a political seam that has proven profitable before -- taking aim at inequality that has deepened as the wealthiest Americans prosper and the middle class struggles to emerge from the worst economic crisis since the Great Depression.
Since Republicans are unlikely to advance Obama's agenda in Congress, Obama will try to directly mobilise the American people behind his priorities in the prime time address.
He will also wield his own powers to the limit, though what he can achieve through executive order is more limited than what is possible through congressional action.