Election and Pledges

I was reading about the Caucus round 2 in New Hampshire and here is the small snippet from the radio ad about Tax Pledge by Mitt Romney (A republican candidate)-

"When I’m president, for every middle class American, the new tax rate on your interest, dividends, and capital gains will be absolutely zero."

Do we see this happening anytime in future? This seems to be too good to be true and one can infer very easily practically analyzing it that this is total BS!!

Few days back i had a discussion with my friend about paying taxes (eventually in 401K) and she was completely against paying taxes. Some false promises like above can definitely make some people (like my friend ) happy.