Ahh, the famous cheat of checks notes changing your mind weeks before announcing a decision.
Biden was never running against Trump in the 2024 election. The Democrats still have not announced a candidate. If the Republicans wanted to campaign against the presumptive nominee before an official decision was made, that's on them.
1 line of code?
Amateur, I changed 1 byte of code in the Linux kernel!
It was random driver with something along the lines of "if (hardware_version > 3) fail()".
One day we got a new shipment of hardware that wasn't working for some reason until I upped that 3 to a 4.