Disillusionment has set into the one-time supporters of Hopenchange, according to a new Bloomberg poll of likely midterm voters.  Nearly 40% of those who previously supported Barack Obama now disapprove of his job performance.  The number grows among women and independents, where majorities of both have abandoned the President:

Hope has turned to doubt and disenchantment for almost half of President Barack Obama’s supporters.

More than 4 of 10 likely voters who say they once considered themselves Obama backers now are either less supportive or say they no longer support him at all, according to a Bloomberg National Poll conducted Oct. 7-10.

Three weeks before the Nov. 2 congressional elections that Republicans are trying to make a referendum on Obama, fewer than half of likely voters approve of the president’s job performance. Likely voters are more apt to say Obama’s policies have harmed rather than helped the economy. Among those who say they are most enthusiastic about voting this year, 6 of 10 say the Democrat has damaged the economy.

The worst news comes from two constituencies that lifted Obama and the Democrats to victory in 2008.  Among likely-voter women who supported Obama in 2008, more than 60% have changed their minds, portending a very difficult battle in Obama’s re-election in 2012.  Fifty-three percent of independents who voted for Obama now disapprove of his performance.

Interestingly, the perception of Obama as anti-business hasn’t resonated, with only 36% of likely voters professing that belief.  There is a significant perception on the Left that Obama has been too pro-business, as Bloomberg reports from anecdotal comments.  That doesn’t let Obama off the hook for the economy, though, as 47% believe that Obamanomics has damaged the economy, and 53% saying that Congressional Democrats have damaged the economy as well.

We’ll see how the damage to the Obama brand impacts Democrats in three weeks.  With numbers deteriorating like this, and with economists predicting high unemployment and economic stagnation for the entirety of 2011, Obama seems destined to tread the same path as Jimmy Carter by the time Iowa holds its binding caucus in January 2012.