Power, power, power, control, control, control.
Check this out:

Because the Senate wasn’t functioning the way President Obama thinks it should, he supported Democrats Thursday as they overturned 200 years of Senate tradition by essentially doing away with the filibuster.

Democrats invoked the so-called “nuclear option,” allowing presidential nominees be confirmed with 51 votes, instead of 60.

“[T]his was one more step to give President Obama even more power and even more control,” former House Speaker Newt Gingrich said Thursday on CNN’s “Crossfire.”