Likening Democratic U.S. presidential candidate Sen. Barack Obama to a political “trailblazer,” singer Barbra Streisand has become the latest Hollywood celebrity to join the Obama campaign bandwagon, switching from her past support of Sen. Hillary Clinton.

“Barack has awakened in many of us the notion that we can again be hopeful, enabling us to believe that we are capable of lifting our brothers and sisters out of poverty, of providing quality education for all our children, of ending this unjust war in Iraq and bringing our troops home safely,” Streisand wrote on Tuesday in a posting on her Web site, http://www.barbrastreisand.com/.

“He’s reminded us ‘yes we can’…we can make the transition from fossil fuels to green energy; we can take care of our elderly and make sure that good healthcare is not just a perk for a few, but a right for every man, woman and child,” she said. ”We are experiencing not just a presidential campaign, but a movement; a movement of inspired young people who have been cynical about politics for too long.”

Since narrowly defeating Clinton at the end of the U.S. primary elections in June, Obama, a Democrat from Illinois, has picked up numerous endorsements. Clinton, a U.S. Senator from New York, has appeared with him in a show of Democratic party unity. Last week, Obama held a fundraiser in Los Angeles that raised some $4 million to $5 million, and several Hollywood stars such as Dennis Quaid and Samuel L. Jackson were there.

Streisand, of course, is a major Hollywood celebrity and fundraiser for Democrats. Yet, celebrity endorsements have a mixed track record in helping candidates, the experts say. Republican candidate Sen. John McCain also has celebrity endorsements including from actors Sylvester Stallone and Robert Duvall.

Barack Obama found himself surrounded by Hollywood stars at a Los Angeles fundraiser on Tuesday that raised $4 million to more than $5 million for Democrats and the Illinois senator’s presidential campaign, according to a press pool report and the Los Angeles Times.

Obama told the crowd he knew his long campaign against former Democrat presidential rival Hillary Clinton “caused some heartburn and some frustration.” But he added, “we were allies then and we’re allies now.”

Clinton had enjoyed strong support in Los Angeles and among Hollywood’s stars, who first warmed to her when her husband Bill Clinton ran for president in 1992.  But many in her camp are now joining the Obama bandwagon in a sign of party unity against presumptive Republican nominee John McCain.

Obama spoke to an audience that included actors Samuel L. Jackson, Dennis Quaid and Don Cheadle, as well as Sherry Lansing, the former CEO of Paramount Pictures. British-born singer Seal performed his ballad “Kiss from a Rose” and the Sam Cooke soul classic “A Change is Gonna Come,” an apparent reference to Obama’s campaign theme of change.

Seal was introduced by Quaid, who told the crowd: “He’s here tonight to sing for the superman for everyone — Barack Obama.” Rapper Will.i.am of the group the Black Eyed Peas and retired boxer “Sugar” Ray Leonard also were in attendance.

The event was held amid glass chandeliers at the Dorothy Chandler Pavilion, a performance venue that in years past hosted the Oscars.

Money raised at the fundraiser will be split between the Obama campaign and the Democratic National Committee. Tickets to the reception cost $2,300 per person, and VIP tickets cost $28,500 per couple, which allowed those VIPs to attend a dinner with Obama.

American TV superstar Oprah Winfrey might be backing Democratic presidential hopeful Barak Obama, but his rival Hillary Clinton got her own celebrity boost on Monday when Elton John announced he would perform a solo concert on behalf of her campaign on April 9 at Radio City Music Hall in New York.  The event, called “Elton and Hillary: One Night Only,” is the British star’s first public solo concert in New York City without his band in eight years. Ticket prices start at $125.

“I’m not a politician but I believe in the work that Hillary Clinton does,” said John.  “I’m excited to support Hillary by performing at what will be a truly memorable night.”

It’s a tight race between Obama, who would be the United States’ first black president if successful, and Clinton, who also would break new ground by being the first female president.