re: Why would someone vote for Landrieu if he/she also voted against Obama in '12?

Not saying I agree with their argument, but they would say that Mary (due to her tenure and status as a more senior Senator) can get coin to the state.

But this year in particular more than ever it's critical we boot her. It's very plausible that after the Louisiana runoff, we're at 49 Democrat, 49 Republican, with one Independent (the guy from Kansas) and one race to be decided- Louisiana. At this point, a vote for Landrieu means a vote for a continued Obama Senate. I'd like to think at this point those Obama-hating Landrieu voters will realize the stakes and go the other route.