Who is playing politics with nominations?

President Clinton nominated 2 supreme court justices, Breyer and Ginsburg. At the time, Republicans controlled the Senate. Here are the numbers:

Breyer:

87 Yea
9 Nay
4 Not voting

Ginsburg:

96 Yea
3 Nay
1 Not voting

President Bush has also had 2 nominations, here is how those turned out, with the Republicans still in control of the Senate:

Roberts:

78 Yea
22 Nay
0 Not voting

Allito:

58 Yea
42 Nay
0 Not voting

Who exactly is playing politics with supreme court nominations?