Pete Ross was a childhood friend of Superman (Clark Kent) in Smallville.
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History
Pete eventually married Lana Lang, with the two having a son, Clark Ross. The two are presently divorced, even after briefly reuniting. Pete was Vice-President of the United States under Lex Luthor and briefly served as President following Luthor's impeachment but quickly resigned.
Pete was not initially aware of Clark's secret. However, the secret was known by the villainous Manchester Black, who informed then-President Luthor of the secret, only later to wipe his memory of it. Prior to losing the knowledge of Clark's secret, Lex informed Pete that his close friend Clark Kent is in fact Superman. While Pete initially refrained from telling Clark about his knowledge he did eventually tell him.
Ross, Lana and young Clark were kidnapped by Ruin, Professor Emil Hamilton. Pete was framed for the crimes of Ruin; once Superman defeated the insane Professor Hamilton, he was exonerated.
Pete and Lana's marriage didn't last. After the divorce Pete returned to Smallville without Lana to raise their son. Pete and Lana both decided that they wanted to give little Clark the benefit of a good solid Smallville childhood, like they had. The two shared custody of their son. Back in his hometown, Pete was content with running the General Store.