No they didn’t all endorse Mitt Romney, and Rand Paul was very early and enthusiastic and campaigned for Mitt Romney, endorsing him months before the convention, just as now Paul is campaigning for Susan Collins.
Rand Paul has been moving left for some time now and revealing his liberalism/libertarianism, and you are well aware of the growing rejection of him for that reason, as his politics come out into the open.
He is becoming something of a joke here at FR.
May 7, 2012 - Rick Santorum Endorses Mitt Romney For President
May 16, 2012 - Businessman Herman Cain formally endorsed Mitt Romney
Apr 25, 2012 - Rick Perry formally endorsed Mitt Romney for president
Jan 16, 2012 - Jon Huntsman abandoned his once-promising campaign for the Republican presidential nomination on Monday and endorsed Mitt Romney
Check the dates Paul waited until the issue was decided in Romney favor. All you have is spin and lies. I post FACTS.