A Kentucky official said voter turnout appeared strong in the hours after polling places opened.
Secretary of State spokesman Bradford Queen made the comment Tuesday morning as news outlets reported lines at several precincts.
Jefferson County election officials called early voting "heavy" and Fayette County deputy clerk Meredith Watson said turnout was great and officials there haven't seen an increase in problems.
The Kentucky Attorney General's Office said it had received 77 complaints as of mid-morning.
A portion of central Kentucky, including Fayette County, has one of the nation's most hotly contested congressional races in the nation with incumbent Republican Rep. Andy Barr facing off with Democrat Amy McGrath, a retired Marine fighter pilot.
Polls are open until 6 p.m. Secretary of State Alison Lundergam Grimes has predicted the turnout to be 46%.
