Streisand will then sing at the five-star Beverly Wilshire, no doubt reviving the Depression-era standard "Happy Days Are Here Again" with new urgency.
Obama is set to break a single-day fundraising record of $9 million.
Tuesday's events in Tinseltown come after Obama racked up a record-breaking $66 million dollars in fundraising last month, beating his previous high mark of $55 million last winter.
"The fundamentals of our economy are strong, but these are still very, very difficult times," rival McCain said, sunny-side up.
"Sen. McCain, what economy are you talking about?" smiled Obama.