Gotta have serious doubts over Clinton's judgement here, not only in picking someone too close to the center but also putting an otherwise safe senate seat at risk.
No, it wasn't really safe. Virginia's a swing state. The Democrats won that seat by less than 1% in 2006 and about 6% in 2012. Given it will come up in a midterm year it will probably go GOP anyway, look at seats like Colorado and Iowa 2014. And a Democrat Governor gets to appoint a replacement, more progressive picks like Warren or Brown would be replaced by Republican Governors. That's not a reason to oppose this pick.