David Ignatius quotes a Democratic senator wondering how "bi-partisan" Obama really is:

"The authentic Barack Obama? We just don't know. The level of uncertainty is too high," one Democratic senator told me last week. He noted that Obama hasn't been involved in any "transformative battles" where he might anger any of the party's interest groups. "If his voting record in the past is the real Barack Obama, then there isn't going to be any bipartisanship," this senator cautioned.

One wonders who this Democratic senator is. Is it a solid Clinton backer or an unaffiliated senator?