That means, the party in the majority gets to decide which direction the Senate will move. It doesn't matter that a few of the majority party's members are liberal, left-handed or smell bad, having the most members makes your party the majority.
So you see, when the GOP was in the majority we had Specter and Snowe and Collins, but it didn't matter because we had enough of a majority to stop Clinton or to pass welfare reform, but their mere presence made us a majority.
So, it does matter whether the members are Democrats or Republicans because of what? The Agenda.
Oh, thanks, dear lady. What would I do without your kind indulgence?
I just hope that when we get another majority in congress, that the leaders are conservatives, and not liberals.