Actually, your chances of being selected for any given poll are 1 in 313,232.
https://www.cia.gov/library/publications/the-world-factbook/geos/us.html
Well, most polls sample only adults. I was making an approximation of how many kids there are. As of 2009, we had 232 million adults age 18 or older. http://www.census.gov/compendia/statab/2011/tables/11s0007.pdf. The population grows about 1% a year, so it’s probably about 237m. in 2011.
So your chances are 1 in 237,000. My DEEPEST apologies for this error...