Evidently the people were not completely fed up with McConnell.
Check it out:

Sen. Mitch McConnell (R-Ky.) easily defeated his primary challenger, businessman Matt Bevin, in a sour loss for the Tea Party on Tuesday night.

The Associated Press called the race for McConnell right as polls closed at 7 p.m. in the Bluegrass State, where the Senate minority leader had a two-to-one lead over Bevin.

McConnell’s victory sets up a closely-watched and expensive contest against Secretary of State Alison Lundergan Grimes, one of Democrats’ best hopes at a GOP pickup this cycle. Grimes also easily won her nominal primary on Tuesday.

Tea Party groups, long frustrated with McConnell’s leadership, initially had high hopes for Bevin. He drew the backing of the Senate Conservatives Fund and Madison Project, among others, and SCF invested nearly a million dollars on his bid.