As a result of his win, Seymour became the first Democratic presidential candidate to ever win Oregon. Another Democrat would not win Oregon again on a presidential level until Woodrow Wilson won the state in 1912. Democrats wouldn't again win a majority in Oregon until Franklin D. Roosevelt won the state in 1932.
This was the only time a Republican would win a presidential election without Oregon until 1988, 120 years later; every Republican since then has lost the state.
Results
1868 United States presidential election in Oregon[1]