How do political parties influence the selection of canidates running for election at the state and local level?

Yes... the now president of the United States was selected by some of the administration of Ronald Reagan...

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The quick answer is simple. Local politcal parties control who goes on the ballot.

You wanted as essay... we have a problem... whatever the question states... a fact that is written and is televised... most historian agrees that candidates are usually selected by simple means... understand your history... and... in the future... need help with home work... go the site that is suggested...