RedState, on why the filibuster is so "required"

In Which Senator Isakson Makes Himself Irrelevant | RedState: If Republicans are of the belief that there must be an up-or-down vote on bills that violate the most unambiguous part of the Bill of Rights, then what is the purpose of serving in the Senate? Since the Democrats have a clear majority, senators like Johnny Isakson should just stay home. Serving in the minority in the Senate is inherently an invidious task. When confronted with bad legislation, especially bills that violate the Bill of Rights, the only way to obstruct them is by getting your hands dirty with a filibuster. If you’re not up to the task, then go back to Georgia and run for your county school board.