McClellan or Grant. Very good question Hugh.
Bill Frist must be playing Abe Lincoln deciding which direction to take.
McClellan was very good at doing one thing, building an army. He was indecisive and fell apart during the heat of battle, but he could train and organize better that just about anyone you could name. McCellan constantly demanded more troops, he was convinced that the much smaller force standing between his army and Richmond was twice his size and would not move until he had a super-majority.
Grant was out for one thing, victory. He looked at the situation facing him and did the math. We are a larger force, they are a smaller force and should be put on the defensive. We can wear them down. We may pay a price to do it, but we will win.
A great insight into Grant came just after he was named to take over the Army of the Potomac. His staff, who had been with him in the west were talking about his victories and his strategy with the old guard from McClellan's command. The union generals who had been crushed by general Lee time and again where telling Grant's staff that Lee was brilliant and he would hit you out of nowhere, there was no telling what Lee would do next.
Grant heard this, and told McClellan's old staff 'stop worrying about what Lee is going to do to you, and start thinking about what you are going to do to him'.
If the democrats 'Go Gingrich' Bill Frist and the Senate GOP needs to 'Go Grant' on them. Stop worrying about what Harry Reid and Barbara Boxer are going to do to you, and start thinking about what you are going to do to them.
We have the numbers, we have the message, if only we have the will.