''Coalition, she says, has made matters worse because, inevitably and necessarily, it requires compromise, but
it is not adequate as a reason for the Lib Dems' shifts of policy and the refusal to try to promote vigorously the party's core beliefs. "The official line on immigration has clearly moved a mile from where we were in 2010, miles from where we were when we were arguing for an earned route to citizenship and were clearly and unambiguously a liberal and pro-diversity party. Yes, we wanted a better-managed immigration system with exit checks, but we didn't faff around''
It is entirely understandable that she, as with thousands of voters became disillusioned following breaks from all Liberal Democrat policy, a career politician would toe the party line forevermore.
Sarah didn't, I don't see this as a negative and far from 'floating about' she has obligations.
http://www.theguardian.com/politics/.../sarah-teather