After his gun-grabbing escapade, this phrase is now unfortunately an oxymoron.
The (only) measurable difference between the Democrats and the Republicans today is that, in the main, the Democrat Party listens to its base. The Republican Party takes pitchforks to its base.
Would agree pretty much with that statement, assuming you are talking about the Washington establishment parties. The possible equalizer, though, is that the potential GOP base is much wider than the 'Rats, since conservatives are supposedly about 40% of the electorate, lefties of various stripes about 20%.
But the 'Rats have a huge edge in implementing election procedures that intrinsically corrupt the voting process and in taking maximum advantage of the opportunities through election cheating and fraud schemes. I'm not advocating that the GOP should measure up to them in sleazy tactics, but should at least be aware of them and come up with a strong agenda aimed at election procedure changes so as to reduce the quantitative impact of 'Rat fraud and cheating on election results.