Yup. She screwed herself on this one. It was a really stupid and egotistical decision on her part, basically an unforced error that Trump will be able to take great advantage of.
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Ginsberg didn't retire because the republicans won the senate in 2014. She needed both a democrat president and democrat controlled senate to confirm a suitable replacement for her. She didn't want a middle of the road nominee which Obama would of had to pick with a republican senate.