Lanny Davis, a staunch supporter of Hillary Clinton, has launched an online petition drive to encourage Barack Obama to chose Hillary Clinton as his running mate.

“Obama can win without her, but he can’t lose with her,” Davis told MSNBC, contending that Clinton could help the Democratic ticket win the support of more women and Latino voters. Davis said he’s doing this independently, without the Clinton campaign’s endorsement or encouragement. The petition, which debuted late Tuesday, asks Obama to invite Clinton to share the Democratic ticket in recognition of the “more than 17 million Democrats who supported her at the polls.”

“Both you and Senator Clinton during this campaign have demonstrated strengths in different segments of the electorate and in different parts of the country,” Davis writes in the petition. “Together, you stand the best chance of making U.S. history not once but twice — the first African American president and the first female vice president since the founding of our great nation.”