Former congressional candidate Art Robinson said today he will seek the chairmanship of the Oregon Republican Party because the party needs to be strengthened. Robinson, a Cave Junction resident, said he could rally a party reeling from the November election. Republicans lost their share of control in the state House and saw their best hope for a statewide office, Knute Buehler, lose to Secretary of State Kate Brown. “There are a lot of things that can be done,” Robinson said. “We’re not winning, we’re losing.” Robinson lost his second bid against U.S. Rep. Peter DeFazio, D-Springfield. The chemist, who runs …