There were numerous safeguards to assure that the ballot wasn't fixed, so your claim that the ballot was easily fixed comes out of thin air. (And, so you say. I can't cite anything, but this is a generally held position.) Besides, it's totally disingenuous to argue simultaneously that Caesar was elected because he was popular AND to argue that Caesar could not be elected because the system was stacked against him. You can't have it both ways. (Don't recall this argument.) Either Caesar was popular enough to get elected in the first place and thus--if he remained popular after killing most of his enemies in the civil wars--had nothing to fear from another election, OR Caesar was PART of the political machine that stacked the deck against outsiders (Thus, the election could be fixed!) and thus--again--had no reason to fear elections once he had supreme power.
Is too much to expect even the most elementary logic from Caesar's cheerleaders? (I really do hate to say this, but your logic seems to fail here.) Have you never asked yourself just once why--if Caesar were so popular--he quit running for office and (indisputably) accepted this unheard-of office dictator in perpetuum? If you have even the slightest sense of sincere sympathies for the populares, doesn't this betrayal of the sovereignty of the people (or the sovereignty of the Senate) send shivers down your spine? For a populare (Thank you for the gratuitous 'compliment'.), this defense of Caesar's dictatorship is pure, shameless hypocrisy.
According to your general argument, prior to Caesar's crossing the Rubicon, all was well in Rome. The Senate held the 'populares' in high esteem. It didn't have a contract with Pompey. Cicero wasn't playing it safe. And, the Senate wasn't corrupt. Senators didn't practice usury and trade through their agents.
Perilous times demanded action - Caesar was the man of the hour. The 'liberators' had their own pockets in mind and by no means whatsoever the common good nor the state's well being.