To the growing list of Democrats proclaiming themselves "Ready for Hillary," add Sen. Mark Warner (Va.).

Warner, a former governor and businessman who has long entertained his own run for national office, is headlining a fundraiser for Ready for Hillary, the grassroots super PAC laying the groundwork for Hillary Rodham Clinton's potential 2016 presidential campaign.

Warner is slated to appear as a "special guest" at a fundraiser Aug. 5 in Richmond alongside a number of close associates and other prominent Virginia Democrats, according to an invitation posted on Ready for Hillary's Web site.

Warner's move comes after fellow Sen. Timothy M. Kaine (D-Va.) signed up to help Ready for Hillary during a May visit to South Carolina, where he called Clinton "the right person for the job." A number of other senators have made similar declarations, including two top Democrats, Charles E. Schumer of New York and Richard J. Durbin of Illinois.

Ready for Hillary announced this week it had raised more than $2.5 million from more than 43,000 contributors between April and June, bringing its total to $8 million since its founding last year.

The group is working to build a list of Clinton supporters and convince the former secretary of state that, if she runs for president again, she would have an enthusiastic base of backers.

Ready for Hillary has relied heavily on small-dollar donations. The ticket price for the Richmond fundraiser featuring Warner is a symbolic $20.16, while event hosts are being asked to contribute $201.60.

The Richmond event's co-chairs are: Tyler Bishop, who served in Warner's administration and has advised current Gov. Terry McAuliffe; Mark T. Bowles, a donor who co-chaired McAuliffe's inauguration; Keyanna Conner, a party activist and Warner campaign aide; Larry Framme, a former Virginia Democratic Party chairman; Eva Hardy, a former Dominion Power executive and Warner's campaign chairwoman; and Susan Swecker, a Democratic National Committee member.