The most competitive primary in Kentucky will come to an end Tuesday.Seven Republicans are vying to replace retiring incumbent Geoff Davis in the Fourth Congressional District. County judge-executives Gary Moore and Thomas Massie and state representative Alecia Webb-Edgington are considered the frontrunners. Those three have raised the most money and former GOP operative Les Fugate says they have the best organizations. But he says outside help from two Super PACs has tilted the odds in Massie's favor.“At this point my guess would be that Thomas Massie would be the winner, just from the sheer volume of ads that have gone up," he says. "But the question is which messages are resonating with voters and the three candidates sound a lot alike,” he says. “I would just say it wouldn’t surprise me to see any of those three candidates win. But what’s really important here is that whoever wins that race is most likely going to be the congressperson. It’s really difficult for a Democrat to win in the Fourth Congressional District and now with redistricting it’s even more Republican than it was before."Two Democrats are vying for their party’s nomination in the district.