The Washington Post has put together a great chart to show how the Democratic tax plans actually help those making less than $250,000 a year more than the Republicans. The Democratic tax plan also costs $36.6 billion less than the Republican one:

(Click for larger view)

So when you look at it in simple graphical form, you quickly see that the Republican plan only takes care of the top 2% of the country, while the Democratic plan takes care of the remaining 98% of the country. So why are we even debating this? My only guess is that myth called the Right Wing Noise Machine.