So Barack Obama wants Judd Gregg [(R) New Hampshire] to be Commerce Secretary. Because that would require Gregg to leave the Senate and give New Hampshire's Democratic governor an appointment to the Senate, that means Democrats would have a filibuster-proof majority in the Senate. That means they could ram through anything they wanted.
Note: On reflection, I deleted my last line about ego, and all the more so because I used the word "traitorous." That's over the top. I can't look into Judd Gregg's heart and know what would motivate him to accept Obama's offer. I'll just say that I think it would be a very bad move on his part, especially for what it could do to give one party the ability to ramrod anything they want.