McCain’s VP pick really was purely to garner votes from the far-right Christian extremists of the party. Nothing else about it makes any sense:

Palin’s small town secured big federal funds

As mayor, VP pick obtained millions in funds, a tactic McCain has criticized

ST. PAUL, Minn. - Alaska Gov. Sarah Palin employed a lobbying firm to secure almost $27 million in federal earmarks for a town of 6,700 residents while she was its mayor, according to an analysis by an independent government watchdog group. [...]

In introducing Palin as his running mate on Friday, Sen. John McCain cast her as a compatriot in his battle against wasteful federal spending. McCain, the Republican presidential candidate, hailed Palin as a politician “with an outstanding reputation for standing up to special interests and entrenched bureaucracies — someone who has fought against corruption and the failed policies of the past, someone who’s stopped government from wasting taxpayers’ money.”