“Career politicians” are often derided but there’s something to be said for the well trodden path of local campaigner, councillor, parliamentary candidate and, eventually,
Member of Parliament.
Floating Voter
My money’s on bad advice. Anyone who spent their career outside party politics before being elected to Parliament at the first attempt, appointed to the shadow cabinet a year later, elected party leader four years later and PM 9 years later is unlikely to have well developed political instincts.