Probably very little. CIA's history is not encouraging. They failed to predict the breakup of the Soviet Union in the late 1980s. They spent eight years attempting to destabilize the Bush administration with embarrassing leaks and the Valery Plame affair. They claimed the Iranians had closed down their nuclear weapons program. They failed to warn of 9/11. They still have their agents working out of US embassies. Not an impressive record.
Today CIA is claiming the hacks against the Democrats were done by the Russians. Maybe. Maybe not. Granted the Russians have the capacity, but so do a bunch of others, ranging from individuals, small groups, large groups and plenty of nation-states. China and the NORKs have the capability and they don't like us much. ISIS has the capability and they really don't like us. Plus the democrats were a pretty soft target. Word has it that Podesta was so clueless as to fall for a phish email, you know the ones that claim there is a problem with your account and you need to give us your password to make it right. According to the Wall St Journal, the Republicans had tighter security and the hacker[s] failed to penetrate them.
I'd give more crediblity to the Russian theory if I heard it from some truly competent people, like Microsoft, Kaspersky, Malwarebytes or even NSA. I used to do contract work for NSA, and NSA did have people who knew what they were doing. I cannot say that about CIA.