Ophthalmologist Rand Paul leads Democratic Lieutenant Governor Daniel Mongiardo 51% to 34%. Last month he led Mongiardo 48% to 37%. Three percent (3%) prefer some other candidate, and 12% are undecided. [...] Trey Grayson, Kentucky’s secretary of state, is locked in a tight GOP Primary battle with Paul and registers similar numbers against the two Democrats. Grayson leads Mongiardo 46% to 33%. Five percent (5%) opt for some other candidate, while 16% are undecided. In February, Grayson had a 49% to 35% lead in this match-up. With Conway as his opponent, Grayson earns 49% of the vote to his opponent’s 31%. Last month, he was ahead by a much narrow 44% to 40%. Given this match-up, six percent (6%) favor another candidate, and 14% are undecided.