Dan J. Sullivan Jr., a Senate candidate in Alaska who has made headlines for sharing a name with incumbent Sen. Dan S. Sullivan, R-Alaska, has officially advanced to the general election, The Associated Press announced on Wednesday.He joins Sen. Sullivan and former Rep. Mary Peltola, D-Alaska, as the third of the final four candidates.Alaska has yet to announce the fourth.Sullivan Jr.’s advance, which seemed likely after the polls closed last Tuesday, complicates the picture for Republicans as they work against the clock to explain why two candidates have the same name — as well as which one t...