Williams is seeking a fifth world title on the Alpari World Match Racing Tour.
Mr. Vas, who is also a state assemblyman, was seeking a fifth consecutive term.
Seeking a fifth term despite accusations of graft, the 69-year-old prime minister has faced stiff competition.
Mayor Gibson, elected first in 1970, three years after the Newark riots, is seeking a fifth term.
Mickelson is seeking a fifth major and first US Open as he celebrates his 43rd birthday on Sunday.
Sheriff Catron, 48, was seeking a fifth term when he was shot on April 13 minutes after a campaign speech.
Mr Howard, seeking a fifth term as prime minister, accused Mr Rudd of endangering Australia's coal industry, one of its biggest exporters.
In 2018 he will be 68 years old and seeking a fifth term, while Mr Castro will be a fresh face at 44.
In 2012, Barrow, seeking a fifth term at 57, was widely viewed as on the verge on defeat in his rural-suburban district.
It was a great success, a big success," said the Swiss, who is seeking a fifth term as head of Fifa next year.
What happens in Lower Saxony will not only be seen as a pointer for the general election in September, when Mr Kohl is seeking a fifth successive term.
