Bill Maher has reportedly become one of the biggest backers of pro-Obama super PAC Priorities USA Action.

The liberal comedian and talk show host on Thursday night presented a $1 million personal check written to Priorities during his comedy special "CrazyStupidPolitics: Live from Silicon Valley" which streamed on Yahoo.com.

Publicist Sarah Fuller later told Deadline Hollywood that Maher considers the donation "the wisest investment" he could make, believing that keeping Obama in the White House is "worth a million dollars" compared with the Republican alternative.

A spokesperson for Priorities USA Action did not immediately respond to ABC News request for comment on the gift.

Maher's $1 million contribution comes as the liberal group struggles to raise funds to compete with its pro-Republican counterparts.

Priorities USA Action raised just $4.1 million in all of 2011, relying largely on benefactors like Dreamworks CEO Jeffrey Katzenberg who gave $2 million and director Steven Spielberg  who chipped in $100,000.

The group reported a relatively meager $59,000 in donations in January.

Last month President Obama moved to encourage his supporters to support Priorities, reversing an earlier decision to maintain distance from the group.