That could very well be. Lyndon Johnson and Daley were not ones to be trifled with back then. Here’s a less conspiratoral view of it from a search:
“Back in 1960, more than a few outraged Republicans urged Nixon to challenge the results in Illinois and Texas, even if that meant putting the election on hold for several weeks or even months.
But Nixon refused to pursue the matter, saying at the time that he did not want to be responsible for delaying the transition of power from one administration to the next.
That was true, but only as far as it went. In an interview some years later, Nixon told a reporter he had given very serious thought to taking legal action that, if successful, would have reversed the results in the two contested states and made him the president-elect.
He said the main reason he decided against that course was because Kennedy had won the popular vote. And even though JFK’s margin of victory was extremely slender (barely more than 100,000 votes) it was a clear plurality, and Nixon said he had no stomach for a fight that would pit him against the will of the people even if it did lead him to an electoral triumph.”
Thanks for the reminder. I have read this or a similar article previously.