"We can't imagine Washington without Barbara Boxer," the duo told supporters.
Speaking of imagination, Boxer certainly has inspired some imaginative ads from opponent Carly Fiorina, whose campaign spots include a video of a giant disembodied Boxer head floating over California.
Crazy commercials aside, Fiorina has a shot against against Boxer, despite the longtime senator initially polling ahead of challengers, she's now about even with Fiorina and gay-friendly Republican candidate Tom Campbell.
Boxer's war chest is considerable, even without the help of DeVito and Perlman. But a little extra cash from powerful friends never hurt.