A new Rasmussen Reports telephone survey of likely voters in Delaware shows Republican Mike Castle leading Democrat Chris Coons by 21 points, 53% to 32%. Eight percent (8%) prefer some other candidate, and another eight percent (8%) are undecided. A month ago, just after state Attorney General Beau Biden’s surprise decision not to enter the Senate race, Castle led Coons in a hypothetical match-up 56% to 27%. Last October, Castle led Biden 47% to 42% in an earlier hypothetical contest for the seat Biden’s father, now the vice president, held for 36 years.