Recent justices and who appointed them:
(deceased) Rehnquist - Nixon (R) [Reagan appointed him Chief Justice)
(retired) O’Connor - Reagan (R)
Stevens - Ford (R)
Scalia - Reagan(R)
Kennedy - Reagan (R)
Souter - Bush I (R)
Thomas - Bush I (R)
Breyer - Clinton (D)
Ginsberg - Clinton (D)
Roberts - Bush II(R)
Alito - Bush II (R)
It would appear that anyone would have a difficult time blaming the ills of the SC on the Dems, considering only 2 of the current nine and previous two were appointed by Republicans.
http://www.usscplus.com/info/justices.htm