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Head-to-head

CASSITY, R.O. vs YEN, ERVIN STONE DR

Same race2-way comparison

Side-by-side party, office, state, district, and FEC totals from the FEC. Read our methodology for how we collect and verify this data.

Candidate A

CASSITY, R.O.

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Democratic candidate for U.S. SenateOK

Sourced facts

Legal name
CASSITY, R.O.
Party
Democratic
Office sought
U.S. Senate
State
Oklahoma
Incumbency
Challenger / Open seat
FEC candidate ID
S0OK00420

Campaign financials (2026)

No FEC filings yet for the 2026 cycle.

Once this candidate's first filing is on record, totals will appear here.

Candidate B

YEN, ERVIN STONE DR

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Democratic candidate for U.S. SenateOK

Sourced facts

Legal name
YEN, ERVIN STONE DR
Party
Democratic
Office sought
U.S. Senate
State
Oklahoma
Incumbency
Challenger / Open seat
FEC candidate ID
S6OK04270

Campaign financials (2026)

No FEC filings yet for the 2026 cycle.

Once this candidate's first filing is on record, totals will appear here.