Not to say that there isn't plenty of corruption all around, but the Democratic party is based on ideology that is inherently corrupt. Democrats tend to favor taking wealth form those who have rightfully earned or produced it, to be used for the benefit of those who have not. They take the side of homosexuals, transsexuals, and other forms of immoral perverts, against that of decent, moral people. They tend to take the side of criminals, especially violent criminals, against that of law-abiding citizens. They tend to support the slaughter of innocent children, in the name of “choice”. In the conflict between good and evil, Democrats, much more often than Republicans, can be found unabashedly taking the side of evil.
And of course, since the Democratic platform is much heavier into exercising the power of government in opposition too the liberty of individuals, this greater use of government power brings, with it, greater corruption.