Whats up with Capital Gains Tax

I was reading editorials, trying to expand my knowledge of government and politics, when i stumbled across an editorial titled "Why cut taxes for wealthy investors?". This editorial discussed the capital gains tax, and what the plans for the future of this tax could hold. My first question was, "what is a capital gains tax?" Capital gains tax is the taxation for the difference or "profit" made from selling an asset for more than it was originally purchased. The second question that arose for me was, “How does this capital gains tax affect the wealthy investors of this country?” Well, it happens to be that 76% of the capital gains tax is paid by the households that have a salary of at least $250,000 a year. Whereas households that bring in $100,000 a year or less pay only 12%.  What could be gained from eliminating this type of tax? Well first off, eliminating the capital gains tax would mean that the wealthy keep more of their money, which in effect would widen the gap between wealthy Americans and the middle and lower classes. This lets the wealthy increase their fortune while keeping the lower and middle classes in a stationary position. This would be deepening the class warfare that is currently raging through our nation. If this is the case, why are election hopefuls such as Ron Paul and Herman Cain proposing the elimination of this form of taxation? There is one simple explanation. If they offer to remove this tax more well-to-do individuals will support the candidate and possibly donate to their campaign fundraisers.