Usually around 70 percent
http://www.census.gov/prod/2006pubs/p20-556.pdf
Actually the newest Statistical Abstract of the US (with estimates from 2010) says barely 60% in one place, and just over 60% in another.
According to the United States Census Bureau's 2014 report, there are approximately 146,311,000 registered voters out of a potential 218,959,000 eligible to vote. This amounts to a percentage of ~66.82%.
Note that the Census Bureau releases statsitics reports on voter data every two years. The 2016 report will not be released until November of that year (to coincide with November elections).
Whilst there is no public data for last years Presidential election, 64% of those who were eligible to vote actually cast a vote during the Presidential election of 2008.
According to one website, about 67% of eligible Americans are registered to vote.
30 percent
The percentage of registered voters who participate in US elections can vary by election. In recent years, turnout rates have ranged from around 50-60% in midterm elections to 60-65% in presidential elections.
All registered US voters.
190 million
There are no official numbers, as the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) doesn't ask its members if they are registered voters, and you do not need to disclose your religion in order to register to vote. Most American adults are registered to vote, but many do not actually vote. Mormons are encouraged to vote, so the percentage of registered Mormon voters may be higher than the general population. As a conservative estimate, I'd say there are at least 3 million registered Mormon voters in the US.
Registered voters. That means you are 18, a US Citizen, not a convicted felon, and registered to vote.
Elegible and registered
The percentage of undecided voters in the US can vary depending on the specific election and polling data. Generally, it hovers around 5-10% leading up to an election, but this can fluctuate based on campaign developments, candidate performance, and external factors. Polling organizations track this number to gauge the level of uncertainty in the electorate.
150 milliuon
It can vary based on definitions and surveys, but generally around 20-30% identify as liberal, while around 30-40% identify as conservative in the US. The remaining portion often identifies as moderate or independent.
Enough for obama to win the election
Enough for obama to win the election