Reasonable questions, but it is helpful to consider EVERYONE as wearing either a White or Black hat. It keeps things neat, and minds ordered. Confusion is the cousin of deception, and deception is the mother of error.
The main reason to unite in keeping her from being approved in any way is it strengthens Republicans for the battles ahead, such as the elections and 2012 and a host of other tests. Discipline has been proven to raise your side's morale and lower the morale of the other side. Better be united in a poor cause than disunited in pursuit of a good one.
We can only win by being unalterably opposed to every enemy initiative. We are facing an implacable, united, AND EVIL, foe in the form of the Demonrat Party, and our best weapon is unity and resolve of the highest order. That is just one reason why NOT opposing her is treason to the nation, and disloyalty to the Republican Party. We need to sharpen the minds and stiffen the resolve of the American people if we are to have any chance to save the Republic, and discipline and radicalization is the best and proven way to that goal.