I'm tired of the racist double standard.

A Democratic operative in Kentucky attacked Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellAlabama election has GOP racing against the clock McConnell PAC demands Moore return its money Klobuchar taking over Franken's sexual assault bill MORE's (R) wife's ethnicity again, and somehow the offending political operative continues on.

To be clear, McConnell's wife, Elaine ChaoElaine Lan ChaoTrump admin launches program to help veterans become commercial pilots Senate confirms Lyft manager for No. 3 post at the Transportation Dept Overnight Health Care: Trump tapping Azar for HHS chief | Justices to hear challenge to Calif. abortion law | Group seeks B to fight opioid crisis MORE, has been Asian her whole life. It is not a secret. She did not even change her name to her husband's surname.

Chao has not even been shy about being in the public eye, having served for eight years in the grueling job of Labor secretary, fighting to reform a department that has been a wholly owned subsidiary of Big Labor since its inception.

As a public figure, Chao has been, rightfully, put through the political mill with attacks of all sorts directed at her.

The one thing that neither she nor her husband should endure in 21st-century America, however, is an attack based upon her ethnicity.

Yet, that is exactly what high-level Democratic operatives have done in at least in two high-profile cases over the past year. All in the cause of trying to convince voters that her husband cannot be trusted because he married a highly successful, professional woman who happens to have been born in Taiwan. Her and her family's story is a true testimony to the opportunity that America presents, yet Kentucky Democrats cannot get beyond where she was born and how she looks.

Here is the offending tweet by Kathy Groob, "Google Elaine Chao, #MitchMcConnell's wife, No mention of Kentucky, she is Asian."

Groob then followed up with other tweets pointing out that Chao is Asian, which is hardly tweetworthy breaking news.

While the Kentucky Democratic Party expressed shock by their surrogate operative's racial attack, when I checked Google, I didn't find a single article about Groob being fired from any position for it. In fact, after her "apology," she continued on her 140-character racial attack.

This is the brave new world in America.

Shock radio hosts are fired for tweeting remarks that are deemed racist, but Democratic Party operatives are given free rein to attack a candidate's wife's race.

It is clear that any Republican posting something along these lines would be immediately kicked to the curb. Yet, Groob's crossing this line is just one more example of the "end justifies the means" world of Democratic politics. A world where it is not only okay to falsely accuse anyone opposing your policies as having racist motivations, but it is also okay to attack a senator's wife based upon the country she was born in.

If Kentucky Democratic senatorial candidate Alison Lundergan Grimes does not disassociate herself from every group with which Groob is involved, it is fair to assume that she is, in truth, comfortable with this racist attack.

It will be interesting to see if the Kentucky media and indeed, the national media, hold Grimes, their handpicked darling, to the same standards they would hold any Republican politician. Somehow I think they won't.

Manning is vice president of public policy and communications for Americans for Limited Government. He previously worked for Secretary Chao at the U.S. Department of Labor.