Mark Warner getting back into the 2008 Presidential race?

Several reports about former Virginia Governor Mark Warner (D) possibly getting back into to 2008 Presidential race appeared across the web today. Among those reporting include: Wonkette, Political Insider, PoliticsOne, and Raising Kaine.

Anyone care to speculate how much this has to do with Senator John Warner (R-VA) announcing he will be seeking reelection to his Senate seat in 2008?