The Pew Research Center has recently released a report concerning the demographics of voters and their voting frequency title, "Who Votes, Who Doesn't, and Why."
Here are some of the more interesting findings. People 18-29 are only 22% likely to be a regular voter, while those 50-64 are 42% likely to vote regularly. (Jim Addison has a post on Rock the Vote over at politics.wizbang and how it always fails to motivate the 18-29 year-old demographic.)
Those that make over $75K a year are 44% likely to vote regularly, compared to only 26% for those making less than $20K. Which group do you think would be more likely to vote for candidates promising lower taxes?
I didn't have time to delve deeply into the statistics of the survey (probably a dangerous thing to skip) but overall found the report worth the read.