In 1965, he was elected to the Delaware House of Representatives.

All of the seats in the Delaware House of Representatives are up for election in 2010.

Denney served one term in the Delaware House of Representatives, during the 1905-06 session, and was chosen as Speaker.

In 1968 he was elected to the 1969-70 session of the Delaware House of Representatives.

He was elected to the Delaware House of Representatives in 1984.

All 41 members of the Delaware House of Representatives are up for election.

In 1849, he was elected to the Delaware House of Representatives, returning to private practice in Wilmington the following year.

He was then elected to the 1787/88 and 1788/89 sessions of the Delaware House of Assembly.