Depends on if your in politics for power or because you believe in what you stand for.
False argument. they are not exclusive - in fact one pretty much follows from the other.
You need to be in power to make the things you believe in happen. You know like the Lib dems did with tuition fees.....oh wait a minute.........
Wasn't really an argument but an analogy, you might just believe Banarama music is better even though you'd be financially worse off. The LibDems did try to get of the Labour introduced tuition fees but found the labour run government had run out of money.