He clearly doesn't have much to say about the new tune that completely mocks him.
While Democratic turnout was high, so was GOP turnout on Tuesday, giving the party confidence that its troops have not been demoralized.
"They want us to take on these really urgent priorities", he said, "not just this smallness and pettiness that dominates the national conversation today".
On Tuesday, O'Rourke won just 62 percent of the Democratic vote, while one of his lesser known challengers - Houston progressive Sema Hernandez - not only garnered almost a quarter of the vote share, but captured dozens of border counties.
In his new political ad, a country jingle teases "Liberal Robert wanted to fit in, so he changed his name to Beto and hid it with a grin".
However, a political science professor at Rice University in Houston argues that Trump's presence in the White House is motivating a subset of Democratic voters and independents to turn out to vote to express their opposition to the administration.
Cruz points to the fact that he received 1.3 million of the 1.5 million Repubican votes cast Tuesday while Democrat Rep. Beto O'Rourke got less than half that number in winning his primary. It was a bold move from a man named Rafael Edward Cruz who goes by a nickname for his middle name, Edward, and who objected to disparaging nicknames like "Lyin' Ted" from then-candidate Donald Trump during the 2016 the GOP presidential primary.
The primaries - the first in the nation ahead of November's general election - set up a number of fascinating races. Texas has not elected a Democrat statewide since 1994.
The president is equally unpopular in Texas.
In the last three months of 2017, the O'Rourke campaign raised $2.4m while Cruz raised $1.9m.
O'Rourke, whose family has lived in El Paso for four generations, said Beto was a nickname given to him by his parents at birth.
"We kept hearing about this unprecedented Democrat turnout in Texas and the Republicans showed up in droves yesterday", said RNC Chair Ronna McDaniel. "This is one way for Cruz to indirectly signal that he's not".
Asked if Cruz referred to O'Rourke by his birth name in a bid to cut into his potential support from Latinos, or at least define the Spanish-speaking O'Rourke as squarely Anglo, DeFrancesco Soto scoffed and said Cruz is just employing Trump-esque needling tactics.