Then you can't have it both ways. If a party needs 60 votes to control the Senate, then why is it so important for the GOP to come away from the 2014 elections with at least 51 seats?
Having the majority of the Senate allows a party to decide the agenda. That is important, but it’s not “control.”
To end the debate on a legislative proposal the chamber needs to pass a cloture vote, which takes sixty votes. So, the party can bring up any legislation it wants, but that doesn’t mean it will receive a vote.
If your faction has sixty votes it can schedule the debate, control it, and pass any bill it wants. it has full control of the chamber, not a fraction of it.
http://www.senate.gov/reference/reference_index_subjects/Cloture_vrd.htm