The GOP/RNC has cheated, knowingly, publicly, with "Rule 40" which prevented Ron Paul from potentially winning the nomination at the convention.
The Rule 40 change had absolutely
nothing to do with Ron Paul "potentially winning the nomination at the convention."
When Rule 40 was changed literally one day before the Convention, it was months
after Romney had acquired enough legally-bound delegates to be guaranteed the nomination. The second and third place finishers (Santorum and Gingrich) had both long ago released their delegates and encouraged them to vote for Romney, who ended up with more than 2000 delegates compared to Paul's less than 200 and was going to be the GOP nominee. It is a universe away from what the DNC did to Bernie.
The Rule 40 change had to do with who got to speak at the Convention. Ron Paul was asked by the party if he was going to endorse Romney in his speech, and he said he wouldn't. Given that the primary purpose of the Convention is to select the nominee to run in the general election, the Party leadership decided that having a speaker undermine that nominee wasn't the way things were supposed to work.
So, the party changed the number of states required to have your name placed in nomination at the Convention, which deprived Paul of any automatic speaking slot.
That was the effect and purpose of the Rule change -- not to deprive Paul of "potentially winning the nomination." What's kind of funny about this is that Paul actually one a majority of votes in only
one state. It was after the fact wrangling of delegates that got him up to 5 states.
It's reasonable to debate whether or not that was wise or fair -- I personally think they should have let him speak anyway. But it's
not reasonable to claim that it had anything to do with who actually won the nomination, or who was going to win it. That was decided by bound delegates and the overwhelming support Romney had locked up long before the Convention.
@David.