From graf #10 of Nedra Pickler’s story about the veep candidates for both parties:
[McCain’s] top contenders are said to include Minnesota Gov. Tim Pawlenty and former Massachusetts Gov. Mitt Romney. Less traditional choices mentioned include former Pennsylvania Gov. Tom Ridge, an abortion-rights supporter, and Connecticut Sen. Joe Lieberman, the Democratic vice presidential prick in 2000 who now is an independent.
(emphasis mine, obvs. H/t AC)