Sixty-four of the 68 Republicans serving in the Kentucky state legislature, or, 96 percent of Kentucky's state senators and 93 percent of Kentucky's state representatives have backed McConnell, according to his campaign.

Kentucky Senate President Robert Stivers (R) said in a statement on his endorsement that the Senate Minority Leader has cultivated a strong relationship with state legislators.

"His working relationship with the General Assembly has proven to be invaluable over the years as we work hard to protect citizens and to keep Kentucky competitive. I am proud to stand alongside him and endorse his re-election. No one has proven to be a better advocate for Kentucky than Mitch McConnellAddison (Mitch) Mitchell McConnellYou just can't keep good health policy down Trump threatens to veto omnibus over lack of wall funding, DACA fix Democrats desperate for a win hail spending bill MORE,” he said.

Conservatives in Kentucky have long expressed dissatisfaction with his legislative record, particularly his support for the 2008 financial bailout.

But ith nearly all of the state's legislators backing his bid, the likelihood for Tea Party activists in the state to recruit a credible primary challenger continues to diminish. 

Democrats, too, have yet to front a challenger for McConnell, and one of the most prominent potential contenders, actress Ashley Judd, decided against a bid last week. Democrats are actively recruiting Secretary of State Alison Lundergan Grimes for the race, though she has not yet made a decision.