The sole Republican incumbent was re-elected. Incumbent independent Senator Bernie Sanders was re-elected to a third term. The election was declared in favor of the incumbent Ondimba. Incumbent Democrat Dianne Feinstein was re-elected. It was marked by heated rhetoric between the incumbent and his challengers. Livingstone stood for Labour as 2012 Mayoral candidate against the incumbent, Boris Johnson. Democratic incumbent Rod Blagojevich was re-elected. Incumbent Democrat Bob Menendez was re-elected. Two-term Republican incumbent John Boozman was re-elected in 2016. Incumbent Democrat Frank Lautenberg had been re-elected with 56% of the vote in 2008. Two-term Republican incumbent Pat Toomey was re-elected in 2016. Seven-term Republican incumbent Chuck Grassley was re-elected in 2016. Three-term Republican incumbent John Thune was re-elected in 2016. Two-term Republican incumbent John Hoeven was re-elected in 2016. Eight-term Democratic incumbent Patrick Leahy was re-elected in 2016.