(CNN) - Lanny Davis, one of Hillary Clinton's most stalwart supporters, is stepping up his efforts to land Hillary Clinton in the No. 2 spot on the Democratic presidential ticket, joining the group VoteBoth.com as a senior adviser.
The organization was set up several weeks ago by former Clinton aides with the initial mission of landing both candidates on the same ticket, no matter what the order. In recent weeks the group has pivoted to expressly advocating for Clinton to serve in the No. 2 spot.
Co-founder Sam Arora says Davis, who has become a fixture on cable news shows, will be a "terrific advocate."
"He’s going to be out there making the case for how the Obama-Clinton 'dream ticket' puts Democrats in the best place to beat the Republican machine in November," Arora told CNN.
Often appearing on CNN, Davis has been a tenacious advocate for Clinton during the course of the primary season.
Following Obama's speech on his relationship with the Rev. Jeremiah Wright in March, Davis expressed concern on the Huffingtonpost.com that Obama still had not answered several questions about the controversial pastor. In a Wall Street Journal Op-Ed a month later, Davis again pressed the Illinois senator to address "unanswered questions" about his former pastor more fully.
He also wrote an article on the Huffingtonpost.com in April titled "The Top Ten List of Undisputed Facts Showing Barack Obama's Weaknesses in the General Election Against John McCain.
VoteBoth.com also reports its petition seeking a unity ticket has maxed out its web servers. The petition includes several prominent Democrats, most of whom are backers of the New York Democrat, including Govs. Ed Rendell and Tom Vilsack and Sens. Chuck Schumer and Dianne Feinstein.
Clinton reportedly raised the issue of serving as vice president in a conference call with New York supporters Tuesday. Her campaign said the New York senator is willing to do whatever she can to help the party unify ahead of the fall election.